Patent ID: 8561769

Claim:
An interlocking case system, comprising: a base case comprising: a luggage receptacle and a first overlying lid that together form a luggage compartment, the luggage receptacle having first and second ends and an underside that is opposite to the lid; first and second non-swivel wheels located at opposite side regions on the underside of the luggage receptacle in proximity the first end of the luggage receptacle; a first swivel wheel located on the underside of the luggage receptacle in proximity the second end of the luggage receptacle; a flexible towing strap coupled to the base case; and an interlocking mechanism of the first overlying lid, where the base case is configured to support and interlock with a first upper case when the first upper case engages the interlocking mechanism of the first overlying lid of the base case and when the base case is supported by the first swivel wheel and the first and second non-swivel wheels, and where the first overlying lid of the base case is recessed to at least partially accommodate the first upper case and to resist a horizontal motion of the first upper case; the interlocking case system further comprising a second upper case configured such that an underside of the second upper case is in at least partial direct contact with the first overlying lid of the base case such that the second upper case is not wholly supported by the first upper case when the first upper case is positioned between the base case and the second upper case, wherein the underside of the second upper case is recessed to accommodate the first upper case.