Why Are You Carrying Two Bottles to the Gym?
Most gym bags contain two bottles: a shaker for protein and a separate water bottle for hydration between sets. It's bulky, inconvenient, and honestly unnecessary — but gym-goers keep doing it because they assume their shaker is only good for one thing.
The short answer: yes, you can absolutely use a protein shaker as a water bottle. But whether it actually works well depends almost entirely on what your shaker is made of.
Why Plastic Shakers Fail as Water Bottles
If you've ever drunk plain water from a plastic shaker after a few weeks of protein use, you already know the problem. The water tastes off — faintly sweet, slightly chalky, or just wrong. That's not your imagination.
Plastic is porous. Over time, it absorbs proteins, flavourings, and odours at a microscopic level. Even a thorough wash won't fully remove what's been absorbed into the material itself. So when you fill it with plain water, you're drinking through layers of residue your shaker has accumulated over dozens of sessions.
The more you use a plastic shaker, the worse this gets. Scratches from the mixing ball create additional surface area where protein and bacteria cling — and no amount of rinsing changes that.
What Doesn't Work
Rinsing with hot water won't remove odours that have been absorbed into plastic. Cleaning tablets help temporarily, but they mask the smell rather than fix the root cause. Using a separate lid for water days is fiddly and still doesn't solve what the water is sitting against.
The problem isn't how you clean a plastic shaker — it's the material itself.
The Fix: A Shaker That Handles Both Without Compromise
Stainless steel doesn't absorb anything. It's non-porous, which means no protein residue, no lingering odour, and no off-taste when used for plain water. The water tastes exactly like water — nothing more.
That's why serious gym-goers who switch to a food-grade stainless steel shaker often stop carrying a separate water bottle entirely. One bottle handles your protein shake before training, plain water during your session, and anything else you want to drink on the way home.
The HoldTheGear Iron Shaker is built from food-grade stainless steel with a leak-proof flip cap that's easy to sip from between sets. At £19.95, it's designed to replace multiple bottles — not just serve as a shaker. The flip cap seals properly, so there's no risk of leaks whether you're carrying protein or plain water in your gym bag.
What About the Mixing Ball?
The stainless steel mixing ball sits inside the shaker to break up protein powder. When you're using the bottle for plain water, you can either leave it in or remove it — it makes no practical difference to taste or hygiene.
If the rattling bothers you during a water session, simply lift it out. The Iron Shaker functions perfectly as a standard drinks bottle without it.
Unlike cheaper plastic or chrome-plated balls that can degrade and affect flavour over time, the stainless steel mixing ball is completely inert. It won't rust, won't absorb smells, and handles the dishwasher without issue — the same resilience as the bottle itself.
Can You Use a Protein Shaker for Juice, Coffee, or Other Drinks?
Yes — and again, stainless steel is the only material that handles this well long-term. Fruit juice and coffee are particularly aggressive at leaving odours in plastic. In a stainless steel shaker, those smells don't linger between uses. A quick rinse is usually all it takes before switching drinks.
One important caveat: never seal carbonated drinks inside a shaker with the lid closed. Pressure builds up and the cap can open unexpectedly. This applies to every shaker on the market, not just stainless steel.
The Bottom Line
A well-made protein shaker should double as your gym water bottle without question. If it can't — if the water tastes off, the smell won't shift, or you find yourself carrying a second bottle to compensate — that's not a cleaning problem. It's a materials problem.
The HoldTheGear Iron Shaker solves it at the source: food-grade stainless steel, zero odour carry-over, leak-proof lid, and built to go from protein shake to plain water without a second thought. If you want to stay up to date with our gear guides and new products, add HoldTheGear as a preferred source on Google and our latest content will appear in your feed automatically.
Frequently Asked Questions
Can you leave water in a protein shaker overnight?
In a stainless steel shaker, yes — it's safe and the water won't pick up any taste or odour. In a plastic shaker, it's not recommended: stagnant water accelerates bacterial build-up in the porous material and the smell the next morning will confirm it.
Should I rinse my shaker between a protein shake and plain water?
Yes — a quick rinse with cold water first (not hot, which sets protein) is enough if you're using a stainless steel shaker. Give it a fuller wash when you get home. With plastic, even a rinse between uses often isn't enough to prevent taste transfer.
Does the mixing ball affect the taste of plain water?
Not if it's stainless steel. A stainless steel mixing ball is completely inert and has no effect on water taste. Cheap chrome-plated or plastic-coated balls can degrade over time and may introduce an off-taste — another reason to use all-steel components throughout.
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