Designed to keep cold liquids chilled for up to 24 hours and hot liquids hot for up to 12, the Hydroflask 18oz Standard Mouth Water Bottle is one of the most crucial pieces of equipment to bring along on your next camping trip. The double-wall 18/8 stainless steel construction prevents condensation from building up on the exterior, and the nonporous corners on the inner layer help to kill odors and bacteria buildup.