Hydro Flask insulated stainless steel water bottle — 21 oz Reef Pink with TempShield, leakproof Flex Cap

Hydro Flask 21 oz Reef Pink is an insulated, stainless-steel water bottle with a leakproof flex cap and TempShield double-wall vacuum insulation that keeps drinks cold up to 24 hours and hot up to 12 hours.

This 21-ounce Standard Mouth Hydro Flask in Reef Pink pairs lightweight durability with a bold, color-matched cap and a flexible handle for grab-and-go convenience. Constructed from pro-grade stainless steel and finished in a continuous color that resists fading, the bottle is designed to deliver pure taste without retaining flavors or odors. It fits most cupholders, accepts all Standard Mouth lids, and is safe to clean in the dishwasher for low-effort maintenance.

How long will my drink stay cold or hot?

The Hydro Flask uses TempShield double-wall vacuum insulation to limit heat transfer. In typical use it keeps cold beverages chilled up to 24 hours and hot beverages warm up to 12 hours, depending on initial temperature and environmental conditions.

• 24 hours cold and up to 12 hours hot under normal conditions.
• Insulated stainless steel prevents condensation on the exterior.
• Performance varies with ambient temperature, fill level, and lid seal.

Is the bottle leakproof and easy to carry?

Yes — the included Flex Cap seals securely to prevent leaks when closed, and its flexible handle creates a comfortable carry point. The Standard Mouth profile makes it easy to drink from and accepts a range of compatible lids for activity-specific use.

• Flex Cap is leakproof when fully closed.
• Flexible handle for one-handed carrying or clipping to a bag.
• Compatible with all Hydro Flask Standard Mouth caps and lids.

How do I keep the bottle clean and odor-free?

Hydro Flask stainless steel resists taste transfer, and both the bottle and lid are dishwasher safe for routine cleaning. For deep cleaning, hand wash with warm soapy water or use bottle brushes to reach the base and threads.

• BPA-free materials that don’t retain smells or flavors.
• Top-rack dishwasher safe for the bottle and lid.
• Hand-wash recommended for long-term color preservation and deep cleaning.

Will this bottle fit in cupholders and backpacks?

The 21 oz Standard Mouth shape is cupholder-friendly and narrow enough to slide into most backpack pockets without taking up excessive space. Its durable exterior stands up to everyday bumps and travel while staying light enough for active use.

• Cupholder-compatible diameter for most cars and strollers.
• Compact 21 oz size balances capacity with portability.
• Durable powder-coated finish resists chips and keeps color vibrant.

Who is this for? The Hydro Flask 21 oz Reef Pink suits commuters, students, gym-goers, and outdoor enthusiasts who want a reliable, easy-to-carry bottle that preserves beverage temperature without metallic aftertaste. It’s ideal if you need a mid-size bottle that fits cupholders, travels well in a daypack, and accepts multiple Hydro Flask lids for activity-specific use. Avoid placing it in microwaves, ovens, or freezers; keep hot liquids away from children unless supervised.