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Bottles & Flasks

Nobody wants lukewarm coffee at 7am or a warm drink three hours into a winter hike. A good EDC flask or insulated water bottle fixes both problems without asking much in return; it just lives in your bag and gets on with it. In a British climate, that's not a luxury. It's common sense.   For da… View more

Bottles & Flasks

Nobody wants lukewarm coffee at 7am or a warm drink three hours into a winter hike. A good EDC flask or insulated water bottle fixes both problems without asking much in return; it just lives in your bag and gets on with it. In a British climate, that's not a luxury. It's common sense.

 

For daily use, commuting, and general portability, the 500ml size is ideal. If you're heading out for a full day on the hills, we recommend the larger 750ml option. Double-wall vacuum insulation keeps drinks hot for 12 hours and cold for 24; and that's real hours, not a generous estimate. Our EDC kit guide covers building a carry-around kit, and our survival kit guide takes it further for outdoor use.

 

Klean Kanteen make insulated water bottles and EDC flasks that last for years. Hydrapak are the answer when packing space is tight; they are soft flasks that fold flat once empty. Both are purpose-built bottle bags for easy access. Still unsure? A Kit Assist call with the Heinnie team is free and takes 20 minutes.

 

The right flask, the right bottle. Every day.

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Frequently Asked Questions (FAQs)

What's the best EDC flask for everyday carry in the UK?
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Klean Kanteen's TKWide is one of the most popular, vacuum-insulated, solid-build flasks available in sizes from 355ml to 946ml. It handles the commute, the hills and everything in between, and fits neatly in most EDC pouches.
How long does an insulated water bottle actually keep drinks hot or cold?
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A double-walled vacuum flask keeps hot drinks hot for approximately 12 hours and keeps cold drinks chilled for up to 24 hours. It is worth pre-warming a water bottle with boiling water before filling up your hot drinks; it really makes a difference.
What size flask do I need for hiking?
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A 500 ml flask is fine for a short walk. A full day out requires at least 750ml, especially in summer or during strenuous activities. Pair a hard flask with a collapsible Hydrapak if you're out for multiple days.
Is stainless steel worth it over a plastic bottle?
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For outdoor use in the UK, yes. Stainless steel bottles offer several advantages: they are easy to sterilise, can withstand being dropped, and do not retain flavours.
Can I use the same flask for coffee and cold water?
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Absolutely, it's one of the best things about a wide-mouth EDC flask. A quick rinse between uses and the Klean Kanteen TKWide switches between hot and cold without carrying any taste.