- NEW Integrated Muckguard protects Surge Valve from whatever the trail dishes up - 12oz Size is perfect for Full-Suspension Mountain Bikes - 100% BPA-free insulated water bottle. - The updated design features triple wall insulation, keeping your liquid cooler 2X longer. - The Breakaway Surge valve maximizes flow rate and self-seals to eliminate spills and pushes closed for leak-proof transport. - The innovative Surge Cap is two pieces–cap and valve–and easy to clean. Simply twist, pull, and wash. Plus, they're dishwasher safe. - Crafted in Colorado to reduce environmental impact