Insulated for 1 liter bottles - cool or warm A puffy coat for your bottle! The Primaloft 400 insulation keeps your bevy warm while anti-bacterial and thermo-reflective materials enhance the insulation and keep your bottle clean. A palm handle helps makes sipping easy and the removable carabiner allows for versatile integration into any pack or mobile system. Designed for a 32 oz Nalgene brand water bottle, but fits other similarly shaped bottles too. Water bottle not included.