🏷️ Best Budget
Right, let's be honest about sports bottles. Most of us grab whatever plastic thing is on offer at the supermarket and call it a day. But when Science in Sport — the brand that fuels Olympic athletes — makes a water bottle, we had to wonder: what exactly makes it worth paying attention to? The SIS Clear Sports Water Bottle costs £3.75, which isn't pocket change for what looks like a fairly standard transparent bottle. But there's apparently more to it than meets the eye. We ordered one to see if there's any substance behind the sports science branding, or if you're better off sticking with that freebie bottle you got at the gym.
Here's what caught our attention: Science in Sport has printed measurement marks directly onto the bottle. Not just volume markers, but specific lines designed to work with their sports drink powders. Pour powder to the first line, add water to the second, and you've got the right ratio without faffing about with scoops or guesswork.
We tested this with a few different powders (not just SIS ones), and it genuinely works well. The marks are clear and positioned sensibly. If you're someone who regularly mixes sports drinks, electrolyte powders, or protein shakes on the go, this saves the constant mental arithmetic of working out ratios.
The bottle itself feels solid enough for the price point. It's made from transparent plastic that doesn't feel flimsy, though it's not going to win any awards for premium materials either. The 800ml capacity hits that sweet spot — enough for a proper workout without being stupidly bulky.
The lockable valve is the real star here though. We've tested plenty of sports bottles that claim to be leak-proof but still manage to drip all over your gym bag. This one actually lives up to the promise. Chuck it in a backpack, toss it in your car, or stuff it in a sports bag — we haven't had a single leak.
The wide mouth makes it easy to fill and clean, which matters more than you'd think. Nothing worse than a bottle that develops that slightly funky smell because you can't get a brush in there properly.
Honestly, we expected this to feel like paying extra for branding. But the measurement system is genuinely handy if you're mixing drinks regularly. Our editor uses it for her morning greens powder now — turns out the marks work for more than just sports nutrition.
What didn't surprise us? It's still just a plastic bottle. The black logo looks fine but nothing special, and while the transparent design is practical, it's not exactly exciting to look at.
This makes most sense for regular gym-goers who mix their own sports drinks or supplements. If you're constantly eyeballing powder ratios or carrying measuring cups around, the £3.75 feels justified. It's also decent for anyone who needs a genuinely leak-proof bottle — commuters who chuck bottles in laptop bags, parents dealing with kids' sports kits, that sort of thing. But if you just drink plain water and grab whatever bottle's cheapest? Save your money.
If you regularly mix sports drinks or supplements, the SIS Clear bottle earns its keep with that measurement system and leak-proof design. For plain water drinkers, it's perfectly fine but not essential at this price.
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