Hydroflask 21 Oz Lightweight Standard Flex Cap Obsidian

Ridiculously light, and durable enough for any trail, our 21 ounce Standard Mouth Lightweight Trail Series™ bottle is 25% lighter than our other 21 ounce bottles and provides the best cold hydration experience for your longest adventures. The narrow Standard Mouth opening is ideal for quick sips on the trail, and the slim bottle profile stashes easily into a pack pocket. Engineered to deliver lasting cold refreshment with TempShield™ insulation in an innovative lightweight stainless steel design.

Stainless Steel Construction

18/8 pro-grade stainless steel walls are thinner to reduce weight while maintaining durability.

Lightweight Flex Cap

Honeycomb™ insulated wide mouth cap with a flexible perforated strap and aluminum pivots cut weight in our leakproof design.

Product Benefits

• Ideal for lightweight hydration to keep you going further
• Durable 18/8 Pro-Grade Stainless Steel construction
• TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours
• Flexible perforated strap and aluminum pivots for added weight loss
• BPA-Free and Phthalate-Free

Size & Dimensions