The Camelbak Chute is a large double walled thermos designed to keep 40 oz of goodness cold for a full 24 hours or hot for 6. This is my review. The Chute is primarily constructed from two layers of 18/8 stainless steel with a gap between them, forming a vacuumed, double walled barrier of insulation. … More Camelbak Chute Insulated Thermos Review