$39.95; https://www.hydroflask.com/21-npf-limited-edition/color,yellowstone,a,92,o,334
Keep your drinks as cold as a trout stream or as hot as a geyser while supporting the National Park Foundation, the official charity of America’s national parks. This 21 oz standard mouth hydroflask features TempShield insulation, which eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours. Constructed of durable, Pro-Grade Stainless Steel, Hydro Flask comes with a lifetime warranty and is BPA and Phthalate-Free.