Kottle 100OZ/3 Liter Outdoor Hydration Bladder, Collapsible Military Water Reservoir Pack for Hiking, Camping, Climbing, Easy to Clean Large Opening, Safety and Non-toxic TPU Material, Reusable Kottle Hydration Bladder made food grade safe non-toxic TPU material, BAP-free, anti-bacteria with best quality. Harmless for your health. The mouthpiece water gap and interface are specially designed to prevent water leaking with easily accessible ON/OFF valve. Bite the mouth piece to suck water. Dual Opening Design: Airtight screw cap with handle + Sliding opening, This design allows you to refill in any condition. Cleaning, rinsing and drying are very convenient. You may also add ice cubes into it. Flexible Drink Tube with sturdy insulation sleeve, providing Strong protection and insulation. Tube cover resists temperature changes in hot and cold weathers. Keeps the shape. Selflock house connector: Quick to unhook the hose and remove the bladder from your pack without leaking.