Bags and bag assemblies

A bag comprising:

• a body;
• a shell coupled to the body, wherein the shell comprises a central recessed region and a plurality of recessed regions disposed along the central recessed region;
• a leg mechanism comprising (i) a plurality of legs comprising a first leg pivotably coupled to a first portion of the shell and a second leg pivotably coupled to a second portion of the shell and (ii) a cross member extending between the first leg and the second leg, wherein the plurality of legs are pivotable between (1) a retracted position in which the plurality of legs are positioned entirely within the plurality of recessed regions and (2) an extended position in which one or more end portions of the plurality of legs are positioned outside of the plurality of recessed regions;
• a handle mechanism comprising (i) a first handle portion with a first end pivotably coupled to a third portion of the shell and (ii) a second handle portion pivotably coupled to a second end of the first handle portion, wherein the second handle portion comprises a first engagement feature that is pivotable relative to the first handle portion, wherein the handle mechanism is configured to pivot between (1) a first position in which the first handle portion and the second handle portion are disposed entirely within the central recessed region and (2) a second position in which the second handle portion and the second end of the first handle portion are positioned outside of the central recessed region;
• and
• a linking member connecting the first handle portion to the cross member, wherein the linking member comprises a second engagement feature configured to engage the first engagement feature in order to lock the plurality of legs in the extended position.