Hydro Flask NPF Standard Mouth w/Flex Cap & Boot Yellowstone 21oz

The Hydro Flask NPF Standard Mouth w/ Flex Cap & Boot – Yellowstone 21oz is a premium insulated water bottle designed for everyday hydration, combining portability, durability, and strong temperature retention in a sleek, travel-friendly size.

• 21 oz (621 ml) capacity—perfect for daily hydration without bulk
• TempShield™ double-wall vacuum insulation keeps drinks cold up to 24 hrs, hot up to 12 hrs
• Standard mouth opening for controlled sipping and easy portability
• Includes Flex Cap with carry strap—leakproof when closed and easy to carry
• Comes with a protective bottle boot to reduce dents and improve grip
• Made from 18/8 pro-grade stainless steel—no flavor transfer, highly durable
• Slim design fits most cup holders—great for commuting and travel
• Dishwasher safe + BPA-free for easy care and safe use
• Yellowstone edition colorway for a unique, outdoor-inspired look

This is a great option if you want a compact, durable, and stylish insulated bottle that keeps drinks at the right temperature all day—especially ideal for commuting, workouts, or travel.