Hydro Flask 21 Oz Standard Mouth - 24 Hours Cold
Published on 09/15/2026 at 13:17 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Hydro Flask 21 oz Standard Mouth keeps cold drinks cold for 24 hours and hot drinks hot for up to 12 hours. The bottle is stainless steel, cupholder compatible, and built for refillable daily carry.
Core Details
The product page lists TempShield double-wall vacuum insulation, leakproof closure, pure taste, no flavor transfer, BPA-free construction, and dishwasher-safe care.
Walmart lists the Black 21oz/621ml bottle at $32.95, with 3.25 x 3.25 x 10.00 in dimensions and 1 count on the page.
Brand And Ownership
Hydro Flask is a water bottle brand owned by Helen of Troy Limited, and the company is based in Bend, Oregon, United States.
The Hydro Flask site also groups the 21 oz Standard Mouth line with multiple color options, including Black, White, Reef, Trillium, Birch, Indigo, Sunbeam, Agave, Cascade, and Surf.
Use Case And Verdict
This is a 21 oz insulated bottle for readers who want a compact stainless steel bottle with a standard mouth, a leakproof cap, and a cupholder-friendly shape. Compared with Walmart's listed 24 oz alternative, this 21 oz bottle is smaller in capacity and costs $32.95 on the cited page.
Hydro Flask 21 oz Standard Mouth
Hydro Flask's own page highlights 24 hours cold, 12 hours hot, and a leakproof design.
Fact Box
Hydro Flask 21 oz Standard Mouth Facts
- Product: Hydro Flask 21 oz Standard Mouth
- Manufacturer: Helen of Troy Limited
- Category: Insulated stainless steel water bottle
- Capacity: 21 oz
- Temperature retention: 24 hours cold, 12 hours hot
- Dimensions: 3.25 x 3.25 x 10.00 in
- Price: $32.95 (as of 09/15/2026)
