Vacuum Insulation & Perfect Size - Designed with double-walled vacuum insulation, featuring superior insulation and a condensation-proof design. Volhoply Water bottle can keep hot for 12 hours and keep cold for 18 hours, allowing you to enjoy your favorite flavor in the long run. The cups fit on the car & bike cup holder and inside the backpack - for your hiking, biking, beach, camping and fitness! 1. The thickened version of the waterproof rubber ring is used to make the seal more secure. 2. Our lids handle have been improved. - Able to hold three fingers, relieve finger pressure while walking. 3. The straw is made of soft PP material to ensure that it will not break after long-term use. Multi-Pack & Multi-Color Options Let you one purchase to meet the needs of the whole family. Perfect for that big event coming up such as grand opening, or birthday party. These bottles can also be great party favors, a gift to your favorite client. Premium Material - Constructed of 18/8 food-grade stainless steel, durable and unbreakable. All components are non-toxic, Lead Free, BPA free and environmentally friendly. Electro polished inside, highly resistant to rust. Giving you a clean tasting drink every time! Premium Powder coating offers a steady grip without slipping from sweaty palms and will not fade or fall off. Satisfaction & Guarantee