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 assembly comprising a handle and a first member pivotably coupled to a third portion of the shell, wherein the handle assembly is configured to pivot between (1) a first position in which the handle assembly is disposed entirely within the central recessed region and (2) a second position in which the handle assembly is positioned outside of the central recessed region;
• an engagement feature attached to or integrated with the handle, wherein the engagement feature comprises a latch mechanism;
• and
• a second member connecting the first member to the cross member, wherein the second member is configured to receive the engagement feature in order to lock the plurality of legs in the extended position.