Patent ID: 8534813

Claim:
A set of ink cartridges configured to mount in a cartridge mounting portion of a recording apparatus in an insertion direction, comprising: a first ink cartridge and a second ink cartridge, each of the set of ink cartridges comprising: a main body comprising: a first wall; an ink chamber configured to store ink therein; a communication portion disposed at the first wall and configured to place an interior of the ink chamber into fluid communication with an exterior of the ink chamber; a second wall disposed opposite the first wall, wherein the ink chamber is disposed between the first wall and the second wall; and a bottom wall, and a particular protrusion positioned adjacent to the bottom wall of the main body and extending from a portion of the main body in the insertion direction away from the ink chamber, wherein a first length difference between a first length extending from a rear end of the bottom wall of the first ink cartridge to an end of the particular protrusion of the first ink cartridge in the insertion direction and a total length of the first ink cartridge in the insertion direction, is different from a second length difference between a second length extending from a rear end of the bottom wall of the second ink cartridge to an end of the particular protrusion of the second ink cartridge in the insertion direction and a total length of the second ink cartridge in the insertion direction.