Double Wall Vacuum Insulation and Perfect SizeDesigned with double wall 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 bottles fit on the car & bike cup holder and inside the backpack for your hiking, biking, beach, camping and fitness Lid with Wide HandleAfter market research, we redesigned this cup lid. 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 and Multi Color OptionsWe provide a variety of fashion color for your choice. At the same time, we provide discount packages of 2 packs, 4 packs and 8 packs. Let you one purchase to meet the