Vatna Water Bottles Double Walled Vacuum Insulation Stainless Steel - Long Neck and Bullet Shape Designed - Fits in bicycle water bottle cage or Cup Holder 750 ML/25 OZ Double wall 18/8 stainless steel water bottle with vacuum insulation. Keeps hot beverages hot for up to 12 hours and cold for 24 hours. Wide mouth allows for ice cubes and easy drinking. Super Lightweight and Durable. Easy to carry and fits in most car cup holders.