Telescoping insulated boxes

A telescoping insulated box assembly, comprising:

• an outer box comprising a plurality of outer side walls, the plurality of outer side walls comprising:
• a first outer side wall comprising a first outer side panel, a first inner side panel, a first connecting strip, and a tab, the first connecting strip joined to a top of the first outer side panel by a first fold line and a top of the first inner side panel by a second fold line, the first outer side panel, the first inner side panel, and the first connecting strip at least partially defining a first insulation cavity within the first outer side wall, the tab joined to a side of the first inner side panel by a third fold line;
• and
• a second outer side wall comprising a second outer side panel, a second inner side panel, and a second connecting strip, the second connecting strip joined to a top of the second outer side panel by a fourth fold line and a top of the second inner side panel by a fifth fold line, the second outer side panel, the second inner side panel, and the second connecting strip at least partially defining a second insulation cavity within the second outer side wall, the tab positioned between the second outer side panel and the second inner side panel;
• and
• an inner box, the inner box comprising a plurality of inner side walls and an inner wall forming a portion of a top side of the box assembly, a first inner side wall of the plurality of inner side walls defining a third insulation cavity, the inner wall defining a fourth insulation cavity, the inner box sized to fit into the outer box such that each inner side wall of the plurality of inner side walls faces a different outer side wall of the plurality of outer side walls.