18/8 PREMIUM STAINLESS STEEL - Our stainless steel water bottle is made of durable double-wall food-grade 18/8 stainless steel with an Anti-Slip Powder Coated Finish which is BPA free, non-toxic, and harmless to human health. The internal electric polishing is rust-proof and durable. It will never leave a metallic taste or rust DRINK THE WAY YOU WANT- Maximize your sports water bottle with our 3 replaceable lids: flip-up straw lid, spout lid, and stainless steel lid. (NOTE: The stainless steel lid is plastic from inside and stainless steel from outside.) Our excellent lids are leak-proof.Whether you're camping, hiking, kayaking or rock climbing, NATURE PIONEOR is designed to provide you with the best water solution DOUBLE-WALL VACUUM INSULATION - We water bottles adopt a double-layer insulation wall design and vacuum sealing. This means you can enjoy your favorite hot and cold drinks for a long time, no matter what period you're in. It can keep hot drinks hot for 24