Protein shaker screw top 100% LEAK PROOF drinks bottle 400ml by Musclelinx (Black 400ml)

Strengths include rock-solid leakproof performance, compact design ideal for travel or smaller bags, and plastic that resists staining and smells. It’s also discreet and surprisingly versatile across drinks. Weaknesses lie mainly in its size — 400ml may not cut it for high-volume shakes or hydration use. Opportunities would include offering larger versions or including a simple agitator insert for thicker shakes. Threats mainly come from larger, flashier bottles that offer more volume or mixing features, but at this price point, few match the leak protection and minimalism.After a decade of using everything from blender bottles to fancy steel shakers, I bought this Musclelinx 400ml screw-top bottle on a whim — mostly to throw in a bag for quick travel use. To my surprise, it’s become my daily go-to for protein shakes, electrolyte mixes, and even morning cold brews. The compact 400ml size is perfect for smaller shakes or single-scoop blends. It’s easy to handle, lightweight, and doesn’t look overly “gym bro”, so I’ve ended up taking it into the office and even on dog walks without giving it a second thought.First and foremost, the seal is genuinely leak-proof. I’ve shaken thick protein blends with oat milk and peanut butter in this bottle, then rolled it around in a gym bag with a laptop and clean clothes. Not once did it leak or dribble. The screw lid threads tightly and clicks with a confident turn, and the flip cap sits flush, not springy or flimsy like on some larger bottles I’ve tested. I even did an upside-down soak test for 20 minutes in a sink to mimic a worst-case spill scenario — not a single drop escaped. That kind of reliability is rare at this price.The plastic material is solid — not brittle, not too soft, and surprisingly resistant to staining. I used it with a turmeric-heavy recovery shake that usually turns bottle interiors yellow within two uses, but this one cleaned back to black with no weird film or smell. There’s no internal mixer ball, which at first I saw as a drawback, but the curved inner walls actually prevent powder clumping better than I expected. That said, if you’re mixing thicker mass gainer blends or need high froth, you might want to toss in your own agitator ball.After a week of daily use, hand washing, and fridge storage, the bottle has held up excellently. No warping, no loss of seal, and no residual smells. My only real gripe is the 400ml capacity — while it’s perfect for single scoops, it’s too small for post-workout double scoops or larger water-based blends unless you’re happy refilling. That said, for portability, low visual footprint, and sheer reliability, it nails the brief.This isn’t a flashy or high-tech shaker. It’s a simple, well-designed, no-frills bottle that nails what it sets out to do. It’s compact, genuinely leakproof, and built with better materials than many shakers double the price. I’ve already ordered a second for my wife, who wants one for her iced matcha.

Perfect for my slim fast shakes as they are 250ml I could even drink from the hole or take the lid off. Mixes shake well not had any lumps. Leak proof. You could take it in your bag but I don’t I mix it at 6.30 then put it in a flask to have for my dinner at 1.30 s ok the milk is still cold. Brilliant but highly recommend. Easy washed.

I have just bought a second one of these, it is just as it is pictured and it is great, I have 200ml of liquid so I don't need a big bulky shaker, and this one I can keep in my lunch bag to keep it cool until I need it.The only downside I will say after quite a few uses is the cap doesn't always screw on perfectly on one side but I just keep screwing the lid down until it shuts completely. It doesn't put me off at all as they are really well made and perfect size.

Very handy, does its job and much more. I recommend it 100%. Easy to wash, does not leak, great

Use these for snack at work. Fit into lunch bag. Never leak. Easy to clean. Had one for years and still going.

Great shaker, my favourite to bring with me when needed. Sturdy and allows easy mix

It is fiddly to get it closed using the larger top. The small is loose and will probably get lost.

Bought this as I wanted a small Shaker for EAA supplement before I can drink while in the car.Its simple and feels sturdy enough especially for its weight. The important thing is, it does not leak.Wasn't sure of the screw lid, but actually, it doesn't bother me at all.