Document:

<PAGE>   1
                                                                   EXHIBIT 10(m)

                        THIRD AMENDMENT TO LOAN AGREEMENT
                        ---------------------------------

                  THIS THIRD AMENDMENT TO LOAN AGREEMENT, dated as of October
6, 2000 (this "Amendment"), is among MYERS INDUSTRIES, INC., an Ohio
corporation (the "Company"), the foreign subsidiary borrowers party hereto (the
"Foreign Subsidiary Borrowers", and together with the Company, the "Borrowers",
the lenders party hereto (collectively, the "Lenders") and BANK ONE, MICHIGAN, a
Michigan banking corporation, as agent for the Lenders (in such capacity, the
"Agent").

                                    RECITALS
                                    --------

                  A. The Borrowers, the Agent and the Lenders are parties to a
Loan Agreement dated as of February 3, 1999, as amended by a First Amendment to
Loan Agreement dated August 2, 1999 and a Second Amendment to Loan Agreement
dated August 17, 2000 (as now and hereafter amended, the "Loan Agreement").

                  B. The Borrowers desire to amend the Loan Agreement, and the
Agent and the Lenders are willing to do so in accordance with the terms hereof.

                                      TERMS
                                      -----

                  In consideration of the premises and of the mutual agreements
herein contained, the parties agree as follows:

                  ARTICLE I. AMENDMENTS. Upon fulfillment of the conditions set
forth in Article III hereof, the Loan Agreement shall be amended as follows:

                  1.1 The definition of Euro Borrower in Section 1.1 is restated
as follows:

         "EURO BORROWER" means the Company and/or any one or more Foreign
Subsidiary Borrowers from time to time designated on Schedule 1.1(b) as a "Euro
Borrower".

                  1.2 A new Section 2.19 is added to the Credit Agreement to
read as follows:

         2.19 COMPANY AS A EURO BORROWER. Notwithstanding anything herein to the
contrary, (1) all parties hereto agree that all obligations and liabilities of a
"Foreign Subsidiary Borrower" or a "Euro Borrower" contained in this Agreement
shall also apply to the Company when the Company is borrowing Euros hereunder as
a Euro Borrower, and the Company shall be bound by all such obligations and
liabilities, and (2) the Company will make all appropriate filings and take all
other necessary action with all United States of America and United Kingdom of
Great Britain and Northern Ireland taxing authorities and other Governmental
Authorities to ensure that no withholding taxes or any similar or related taxes,
levies, imposts, duties, charges, fees, deductions or withholdings will need to
be paid or withheld by the Agent or any Euro Revolving Credit Lender as a result
of the Company being a Euro Borrower, and if any such taxes, levies, imposts,
duties, charges, fees, deductions or withholdings are required to be withheld
from any amounts payable to the Agent or any Euro Revolving Credit Lender as a
result of the Company being a Euro Borrower then amounts so payable to the Agent
and any Euro Revolving Credit Lender shall be increased to the extent necessary
to yield to the Agent or such Lender interest or any such other amounts payable
hereunder at the rates and in the amounts specified in this Agreement.

<PAGE>   2

                  ARTICLE II. REPRESENTATIONS. Each Borrower represents and
warrants to the Agent and the Lenders that:

                  2.1 The execution, delivery and performance of this Amendment
is within its powers, has been duly authorized and is not in contravention of
any statute, law or regulation known to it or of any terms of its Articles of
Incorporation or By-laws, or of any material agreement or undertaking to which
it is a party or by which it is bound.

                  2.2 This Amendment is the legal, valid and binding obligation
of each Borrower enforceable against each in accordance with the terms hereof.

                  2.3 After giving effect to the amendments contained herein,
the representations and warranties contained in Article V of the Loan Agreement
are true on and as of the date hereof with the same force and effect as if made
on and as of the date hereof.

                  2.4 No Default or Unmatured Default exists or has occurred and
is continuing on the date hereof.

                  ARTICLE III. CONDITIONS OF EFFECTIVENESS. This Amendment shall
become effective as of the date hereof when each of the following conditions is
satisfied:

                  3.1 The Borrowers and the Required Lenders shall have signed
this Amendment.

                  3.2 The Company shall have delivered such resolutions and
officer's certificates as the Agent may reasonably request.

                  3.3 The Company shall have delivered to the Agent such other
documents and satisfied such other conditions, if any, as reasonably requested
by the Agent.

                  ARTICLE IV.  MISCELLANEOUS.

                  4.1 References in the Loan Agreement or in any other Loan
Document to the Loan Agreement shall be deemed to be references to the Loan
Agreement as amended hereby and as further amended from time to time.

                  4.2 Except as expressly amended hereby, the Borrowers and
Guarantors agree that the Loan Agreement and all other Loan Documents are
ratified and confirmed, as amended hereby, and shall remain in full force and
effect in accordance with their terms and that they are not aware of any set
off, counterclaim, defense or other claim or dispute with respect to any of the
foregoing.

                  4.3 Terms used but not defined herein shall have the
respective meanings ascribed thereto in the Loan Agreement. This Amendment may
be signed upon any number of counterparts with the same effect as if the
signatures thereto and hereto were upon the same instrument, and telecopied
signatures shall be effective as originals.

                                       -2-
<PAGE>   3

                  IN WITNESS WHEREOF, the parties signing this Amendment have
caused this Amendment to be executed and delivered as of the day and year first
above written.

                                          MYERS INDUSTRIES, INC

                                          By: /s/  Gregory J. Stodnick
                                             ---------------------------------

                                          FOREIGN SUBSIDIARY BORROWERS:

                                          MYERS AE, SA

                                          By: /s/  Gregory J. Stodnick
                                             ---------------------------------

                                          MYELin International Finance, SA

                                          By: /s/  Gregory J. Stodnick
                                             ---------------------------------

                                          LISTO PRODUCTS LIMITED, formerly
                                             known as 18936 YUKON INC.

                                          By: /s/  Gregory J. Stodnick
                                             ---------------------------------

                                       -3-
<PAGE>   4

                                          BANK ONE, MICHIGAN, as Agent and as a
                                             Lender

                                          By: /s/ Krista J. Flynn
                                             ---------------------------------

                                          BANK ONE, CANADA

                                          By: /s/ Krista J. Flynn
                                             ---------------------------------

                                          SOCIETE GENERALE NEW YORK BRANCH

                                          By: /s/ Nicolas Guerin
                                             ---------------------------------

                                          KEYBANK NATIONAL ASSOCIATION

                                          By: /s/ J. T. Taylor
                                             ---------------------------------

                                          THE CHASE MANHATTAN BANK

                                          By: /s/ Henry W. Centa
                                             ---------------------------------

                                       -4-
<PAGE>   5

                                          MELLON BANK, N.A.

                                          By: /s/ Debra L. McAllonis
                                             ---------------------------------

                                          NATIONAL CITY BANK

                                          By: /s/ Peter W. Richer
                                             ---------------------------------

                                          STAR BANK, N.A.

                                          By: /s/ Philip M. Daetwyler
                                             ---------------------------------

                                          HARRIS TRUST AND SAVINGS BANK

                                          By: /s/ Michael J. Johnson
                                             ---------------------------------

                                          FIRSTMERIT BANK, N.A.

                                          By: /s/ Stephen F. Mysko
                                             ---------------------------------

                                          FIFTH THIRD NATIONAL BANK

                                          By: /s/ Roy C. Lanctot
                                             ---------------------------------

                                       -5-
<PAGE>   6

                                          DEN DANSKE BANK

                                          By: /s/ Daniel F. Lenzo
                                             ---------------------------------

                                          By: /s/ Bo Andersen
                                             ---------------------------------

                                          COMERICA BANK

                                          By: /s/ Jeffrey J. Judge
                                             ---------------------------------

                                      -6-
<PAGE>   7

                              CONSENT AND AGREEMENT
                              ---------------------

                  As of the date and year first above written, each of the
undersigned hereby:

                  (a) fully consents to the terms and provisions of the above
Amendment and the consummation of the transactions contemplated hereby and
agrees to all terms and provisions of the above Amendment applicable to it;

                  (b) agrees that each Guaranty and all other agreements
executed by any of the undersigned in connection with the Credit Agreement or
otherwise in favor of the Agent or the Banks (collectively, the "Security
Documents") are hereby ratified and confirmed and shall remain in full force and
effect, and each of the undersigned acknowledges that it has no setoff,
counterclaim or defense with respect to any Security Document; and

                  (c) acknowledges that its consent and agreement hereto is a
condition to the Banks' obligation under this Amendment and it is in its
interest and to its financial benefit to execute this consent and agreement.

                                          BUCKHORN, INC.

                                          By: /s/ Gregory J. Stodnick
                                             ---------------------------------

                                          AMERI-KART CORP.

                                          By: /s/ Gregory J. Stodnick
                                             ---------------------------------

                                          BUCKHORN RUBBER PRODUCTS, INC.

                                          By: /s/ Gregory J. Stodnick
                                             ---------------------------------

                                          PATCH RUBBER COMPANY

                                          By: /s/ Gregory J. Stodnick
                                             ---------------------------------

                                      -7-<PAGE>   1
                                                                  EXHIBIT 10(n)

                       FOURTH AMENDMENT TO LOAN AGREEMENT

                  THIS FOURTH AMENDMENT TO LOAN AGREEMENT, dated as of December
31, 2000 (this "Amendment"), is among MYERS INDUSTRIES, INC., an Ohio
corporation (the "Company"), the foreign subsidiary borrowers party hereto (the
"Foreign Subsidiary Borrowers", and together with the Company, the "Borrowers",
the lenders party hereto (collectively, the "Lenders") and BANK ONE, MICHIGAN, a
Michigan banking corporation, as agent for the Lenders (in such capacity, the
"Agent").

                                    RECITALS

                  A. The Borrowers, the Agent and the Lenders are parties to a
Loan Agreement dated as of February 3, 1999, as amended by a First Amendment to
Loan Agreement dated August 2, 1999, a Second Amendment to Loan Agreement dated
August 17, 2000 and a Third Amendment to Loan Agreement dated October 6, 2000
(as now and hereafter amended, the "Loan Agreement").

                  B. The  Borrowers  desire to amend the Loan  Agreement,  and
the Agent and the Lenders are willing to do so in accordance with the terms
hereof.

                                      TERMS

                  In consideration of the premises and of the mutual agreements
herein contained, the parties agree as follows:

                  ARTICLE I.  AMENDMENTS.  Upon  fulfillment  of the  conditions
set forth in Article III hereof, the Loan Agreement shall be amended as follows:

                  1.1 The definition of EBIT in Section 1.1 is amended by the
adding the following to the end of clause (b) thereof: "and a charge for a
reserve not to exceed $3,200,000 taken in 2000 to close a plant and consolidate
operations into another existing plant,".

                  1.2      Section 6.21 is restated as follows:

                  6.21 Interest Coverage Ratio. The Company shall not permit its
         Interest Coverage Ratio to be less than (a) 2.75 to 1.0 as of the last
         day of any fiscal quarter ending on or before June 30, 2001, (b) 3.00
         to 1.0 as of the last day of the fiscal quarter ending September 30,
         2001 or (c) 3.50 to 1.0 as of the last day of any fiscal quarter
         thereafter.

                  ARTICLE II. REPRESENTATIONS.  Each Borrower represents and
warrants to the Agent and the Lenders that:

                  2.1 The execution, delivery and performance of this Amendment
is within its powers, has been duly authorized and is not in contravention of
any statute, law or regulation known to it or of any terms of its Articles of
Incorporation or By-laws, or of any material agreement or undertaking to which
it is a party or by which it is bound.

<PAGE>   2

                  2.2 This Amendment is the legal, valid and binding obligation
of each Borrower enforceable against each in accordance with the terms hereof.

                  2.3 After giving effect to the amendments contained herein,
the representations and warranties contained in Article V of the Loan Agreement
are true on and as of the date hereof with the same force and effect as if made
on and as of the date hereof.

                  2.4 No Default or Unmatured Default exists or has occurred
and is continuing on the date hereof.

                  ARTICLE III.  CONDITIONS  OF  EFFECTIVENESS.  This  Amendment
shall become effective as of the date hereof when the Borrowers and the Required
Lenders shall have signed this Amendment and the Guarantors shall have signed
the consent and agreement attached hereto.

                  ARTICLE IV.   MISCELLANEOUS.

                  4.1 The Company shall pay to the Agent, for the pro rata
benefit of the Lenders signing this Amendment on or before 3:00 p.m., Detroit
time, on January __, 2001, a non-refundable fee equal to 5.0 basis points on the
aggregate amount of each such Lender's Revolving Credit Commitments and
outstanding Term Loan, such fee to be paid on January __, 2001.

                  4.2 References in the Loan Agreement or in any other Loan
Document to the Loan Agreement shall be deemed to be references to the Loan
Agreement as amended hereby and as further amended from time to time.

                  4.3 Except as expressly amended hereby, the Borrowers and
Guarantors agree that the Loan Agreement and all other Loan Documents are
ratified and confirmed, as amended hereby, and shall remain in full force and
effect in accordance with their terms and that they are not aware of any set
off, counterclaim, defense or other claim or dispute with respect to any of the
foregoing.

                  4.4 Terms used but not defined herein shall have the
respective meanings ascribed thereto in the Loan Agreement. This Amendment may
be signed upon any number of counterparts with the same effect as if the
signatures thereto and hereto were upon the same instrument, and telecopied
signatures shall be effective as originals.

                                      -2-

<PAGE>   3

                  IN WITNESS WHEREOF, the parties signing this Amendment have
caused this Amendment to be executed and delivered as of the day and year first
above written.

                                   MYERS INDUSTRIES, INC

                                   By: /s/ Gregory J. Stodnick
                                      ------------------------------------------

                                   FOREIGN SUBSIDIARY BORROWERS:

                                   MYERS AE, SA

                                   By: /s/ Gregory J. Stodnick
                                      ------------------------------------------

                                   MYELin International Finance, SA

                                   By: /s/ Gregory J. Stodnick
                                      ------------------------------------------

                                   LISTO PRODUCTS LIMITED, formerly
                                   known as 18936 YUKON INC.

                                   By: /s/ Kevin C. O'Neil
                                      ------------------------------------------

                                      -3-

<PAGE>   4

                                   BANK ONE, MICHIGAN, as Agent and as a Lender

                                   By: /s/ Krista Flynn
                                      ------------------------------------------

                                   BANK ONE, CANADA

                                   By: /s/ Krista Flynn
                                      ------------------------------------------

                                   SOCIETE GENERALE NEW YORK BRANCH

                                   By: /s/ Nicolas Guerin
                                      ------------------------------------------

                                   KEYBANK NATIONAL ASSOCIATION

                                   By: /s/ J. T. Taylor
                                      ------------------------------------------

                                   THE CHASE MANHATTAN BANK

                                   By: /s/ Henry W. Centa
                                      ------------------------------------------

                                      -4-

<PAGE>   5

                                   MELLON BANK, N.A.

                                  By: /s/ Debra L. McAllonis
                                      ------------------------------------------

                                   NATIONAL CITY BANK

                                   By: /s/ Maurus Kosco
                                      ------------------------------------------

                                   STAR BANK, N.A.

                                   By: /s/ Philip M. Daetwyler
                                      ------------------------------------------

                                   HARRIS TRUST AND SAVINGS BANK

                                   By: /s/ Michael J. Johnson
                                      ------------------------------------------

                                   FIRSTMERIT BANK, N.A.

                                   By: /s/ S.  F. Mysko
                                      ------------------------------------------

                                   FIFTH THIRD NATIONAL BANK

                                   By: /s/ Roy C. Lanctot
                                      ------------------------------------------

                                      -5-

<PAGE>   6

                                   DEN DANSKE BANK

                                   By: /s/ John A. O'Neill
                                      ------------------------------------------

                                   By: /s/ Peter L. Hargrave
                                      ------------------------------------------

                                   COMERICA BANK

                                   By: /s/ Jeffrey J. Judge
                                      ------------------------------------------

                                      -6-

<PAGE>   7

                              CONSENT AND AGREEMENT

                  As of the date and year first above written, each of the
undersigned hereby:

                  (a) fully consents to the terms and provisions of the above
Amendment and the consummation of the transactions contemplated hereby and
agrees to all terms and provisions of the above Amendment applicable to it;

                  (b) agrees that each Guaranty and all other agreements
executed by any of the undersigned in connection with the Credit Agreement or
otherwise in favor of the Agent or the Banks (collectively, the "Security
Documents") are hereby ratified and confirmed and shall remain in full force and
effect, and each of the undersigned acknowledges that it has no setoff,
counterclaim or defense with respect to any Security Document; and

                  (c) acknowledges that its consent and agreement hereto is a
condition to the Banks' obligation under this Amendment and it is in its
interest and to its financial benefit to execute this consent and agreement.

                                   BUCKHORN, INC.

                                   By: /s/ Gregory J. Stodnick
                                      ------------------------------------------

                                   AMERI-KART CORP.

                                   By: /s/ Mark A. Watkins
                                      ------------------------------------------

                                   BUCKHORN RUBBER PRODUCTS, INC.

                                   By: /s/ Gregory J. Stodnick
                                      ------------------------------------------

                                   PATCH RUBBER COMPANY

                                   By: /s/ Gregory J. Stodnick
                                      ------------------------------------------

                                      -7-

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