A disposable beverage container sleeve has a substantially rectangular upper body and a gusset. The upper body has a vertical upper body fold line and an integrated upper body flap along a first vertical edge of the upper body. The upper body flap is adapted to fold over a second vertical edge of the upper body and is affixed to the upper body proximate the second vertical edge. The gusset is formed from a first gusset portion and a second gusset portion, the first and second gusset portions being integrated with and depending from a lower edge of the upper body on opposing sides of the vertical upper body fold line. The gusset further comprises a gusset support band formed by at least one thickness of the first gusset portion and at least one thickness of the second gusset portion.