It’s not ideally designed when considered purely as a drinking vessel: the filtration levels mean there is a lot of drag when you drink through the bottle’s straw and filling it is a pain when the filter soaks up water and is so bulky – you have to leave room for it so the bottle doesn’t overflow. Slimline and lightweight (coming in at just 104g when empty), this bottle is the perfect size for slipping into a small bag or large pocket when you’re out and about. In terms of function, this bottle performs robustly: you might experience some drag when drinking through the sports cap if your tap water is particularly crammed with particles, but even then, the squeezy sides make drinking a cinch. This great-looking, good-value flask is flat, so it can be carried in a car door or wide pocket as well as a bag (or simply in your hand, thanks to the grippy silicone sleeve and a carry handle that's sturdy enough to use when the bottle is full). Although a fairly basic reusable bottle, the Dopper bottle comes with plenty of benefits to make it well worth it.

If you want your water to taste clean, this is a great option, and if you change your mind it even has a 30-day money-back guarantee. It’s also incredibly heavy: built like a dumper truck with a carabiner attached, it’s a whopping 1,240g when filled – although these are probably small concerns when you’re up a mountain on the hunt for clean water. If you want something unique to you, check out our best personalised water bottles, with options from adding photos to light up models. Its double-wall vacuum insulation can keep water cold for an incredible 50 hours and hot for 20, both of which it achieves with aplomb.Although it doesn’t have any insulating properties, this bottle is dishwasher-safe, which is always a bonus. Initially we thought the straw was broken, as the water doesn’t come out in a steady stream, but then realised that the bursts of air were indeed flavoured. This was the best of the canteen-style bottles we tested and is ideal if you’re looking for a compact, sleek, lightweight water bottle. Made from lightweight plastic, it’s a compact size for its 600ml capacity and includes a small carry loop that could be clipped to a backpack. Although the debate over exactly how much water we should drink every day rages on, this bottle will help you stay hydrated all day.

Available in jewel-bright purple or blue, this bottle looks the part and its green credentials go beyond simply reducing plastic waste, as it’s made from 50 per cent recycled material. Or pack a vacuum insulated flask to keep drinks hot for 10 hours, or cold for 24, for delicious drinks while you explore the great outdoors. After doing so, the water clarity is perfect and there's no tang of chlorine or fluoride that you often get with tap water.Remove the black box lid and you find the bottle nestled inside with two choices of lid in black or white. Overall, we mostly enjoy whipping this bottle out thanks to its unusual, vintage-meets-modern look – it comes in 11 colours, from hot pink to black, so you’ll be spoilt for choice. Sturdily made, it sits between double-walled aluminium bottles and single-walled plastic in terms of weight, has a sturdy carrying handle and a unique ‘flip, bite, sip’ straw.