KEEPS COLD UP TO 24 HOURS: Double-wall 18/8 stainless steel construction creates a vacuum seal that helps keep drinks cold for up to 24 hours. The sweat-free exterior keeps backpacks and lunch bags dry — no condensation rings. BUILT TO HANDLE THE SCHOOL YEAR: Made with food-grade 18/8 stainless steel and BPA-free components — durable enough to resist cracking, breaking, and everyday wear from drops, backpacks, and busy school days. TWO SIZES FOR EVERY NEED: Choose the 14oz (6.75 x 2.875 in) for younger kids or the 18oz (8.5 x 2.875 in) for longer school days — both fit standard cup holders and most backpack side pockets. Leakproof when the straw is closed — safe to carry in a backpack or lunch bag without worrying about spills. BUILD A MATCHING SET — Coordinates with matching Wildkin backpacks and lunch boxes, making it easy to build a school-ready set kids love. RIGOROUSLY TESTED: Carefully and thoroughly tested to assure your child's safety. Lid and bottle are both top-rack dishwasher safe. Recommended for ages 3+. Backed by Wildkin's 90-day warranty.