It’s like we’re hard-wired to appreciate that soothing warmth spreading around our bodies like a “Ready Brek” glow. We tested flasks that could hold enough for several people (or someone wanting several cups during the day), as well as some that were designed to serve one. c / Grab handle / Large capacity cup / Made from 18/8, food-grade stainless steel / BPA and BPS-Free. Despite the ‘pouring spout’, we noted that pouring can be a bit slow and splashy if you don’t completely remove the stopper. We provide hints and tips about camping as well as reviews of the gear we’ve found useful over the years.

OKADI is a brand that has been serving people with quality products for the last 20 years and this particular model is their flagship model. The other critical feature is a secure cap, so that even if your flask gets knocked around or accidentally up-ended in a rucksack it won’t leak.Their 20oz Roaster bottle – that’s a capacity of just under 600ml, for us Brits and Europeans – has a standard double-wall vacuum insulated build in 18/8 stainless steel. Meanwhile, the wide mouth makes for easy filling and cleaning, and the powder-coated finish is easy to grip, while staying perfectly cool and decidedly un-sweaty.

It’s a lightweight and portable design with a nice powder-coated finish, which makes the flask easy to hold in one hand. The Hydro Flask has a sturdy lid that engages well into the bottle neck and is thoroughly leak proof. You do need to treat this flask with care, as the stainless steel outer wall is very thin and will dent more easily than others. The downside is that they are a touch on the expensive side – you don’t get this sort of style for free girl! These materials are either poor conductors (plastic/glass) or able to reflect heat back into the hot liquid or away from cold liquid (like stainless steel).

The Hydro Flask Wide Mouth is a quality vacuum flask employing some great tech, a lovely powder-coated exterior surface for great grip as well as excellent heat retention properties. Created with the Thermos® quality and performance you can rely on and with a 5 year guarantee, this flask is a timeless classic.

The size you pick should be based on your individual needs, as well as the activities you might be doing while using it.The main aim of any vacuum flask is to prevent heat loss by either conduction, convection or radiation. Glass-lined flasks are more dangerous because glass walls can also shatter To be safe, it's best to empty the contents after 24 hours. As we said before, vacuum insulation is important for keeping the heat energy inside your flask, and the Hydro Flask does this well. It is definitely more space efficient to use one big flask for the group rather than several small, individual flasks.