Designed with stainless-steel pivots and a flexible strap, this lid moves when you do Made of durable, BPA-free polypropylene PP#5, it's top-rack dishwasher safe Compatible with all newer styles of Hydro Flask wide-mouth bottles (not included) Durable rubber straw with high flow rate Straw cut guide: Trim 2.5 in. off the straw for the 18 fl. oz. bottle, 1.5 in. for the 32 fl. oz. bottle, and just a hair for the 64 fl. oz. bottle