Hydro Flask · Mid-range
The Hydro Flask 32 oz Wide Mouth is an insulated stainless steel bottle that Hydro Flask rates at 24 hours cold and 12 hours hot, with TempShield double-wall vacuum insulation and a wide, ice-cube-friendly opening.
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We have not tested it ourselves: strengths and weaknesses below come from the tests cited.
Chasing trains often means a long wait on an open platform or at a lineside viewpoint, in summer sun or in winter wind, and a drink that stays the temperature you put in it makes that wait easier. Hydro Flask describes this bottle as the one to grab to keep cold drinks cold and hot ones hot, with 24 hours cold and 12 hours hot, so a morning coffee can still be warm at a midday arrival and iced water can still be cold in the afternoon. The maker also says the stainless steel gives a pure taste with no flavor transfer, which matters if the same bottle carries coffee one day and water the next. A bottle that is leakproof when closed, as the maker states, is the right kind to slip into a bag next to a camera.
OutdoorGearLab tested the Hydro Flask Wide Mouth in its 20 oz and 24 oz sizes, found both a little small to last a whole day without a refill, and said the team prefers the 32 oz for days away from home; that test is a neighboring page, not a hands-on test of this size. The maker's page says the wide opening makes it easy to add ice and to take a bigger gulp. The testers filled their bottles with water dyed blue and left them on their sides for 24 hours, and the Hydro Flask Wide Mouth kept all its liquid, even with a flip-up straw lid fitted. They liked the Flex Chug lid best, a wide lid with a small twist-off opening that cuts spills when drinking on the move, and they found the external threads and the lid threads easy to clean with a sponge. Hydro Flask lists the bottle as dishwasher safe. It is not for use on a stove, in a microwave or in a freezer, and hot liquids should be kept out of the reach of children.
Strengths
Weaknesses
| Specification | Value |
|---|---|
| Not for | Stove, microwave or freezer |
| Opening | Wide mouth |
| Capacity | 32 oz |
| Material | Stainless steel |
| Insulation | TempShield double-wall vacuum insulation |
| Hot retention | 12 hours |
| Cold retention | 24 hours |
| Dishwasher safe | Yes |
A railfan who plans a full day out with no guaranteed refill station and wants hot or cold drinks to hold their temperature, and who is willing to carry a heavier bottle than a plastic one. It also suits someone who wants to choose a lid to match the drink, since OutdoorGearLab found different lids suit coffee, water and sipping on the move.
Nalgene 32oz Wide Mouth: lighter and uninsulated, the lighter pick OutdoorGearLab names for hiking. Klean Kanteen TKWide Recycled Insulated: OutdoorGearLab says its metal straw with a silicone tip avoids the plastic taste of the Hydro Flask straw.
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