HydraPak SoftFlask Collapsible Nutrition Flask (250ml, Old Malibu)

These soft flasks have been a total game-changer for my running and biking routine. I started using them to make my own homemade gels, and it’s been one of the best decisions I’ve made—not only for convenience but also for saving money. I no longer need to buy expensive commercial gels, and I have complete control over what goes into my nutrition. The flasks are easy to fill, don’t leak, and are super comfortable to carry whether I’m on a long run or a ride. The material is flexible without feeling flimsy, and they hold up well even after repeated use. What really stands out is how easy they are to clean—no lingering residue or hassle, which is huge when you’re using sticky gel mixtures. Overall, they’re reliable, cost-effective, and perfect for anyone looking to switch to homemade fueling. I’d highly recommend them to endurance athletes who want a simple, reusable solution that just works.

First Impression: I picked up the HydraPak SoftFlask for trail running and mountain hikes where carrying gels or liquid fuel can get messy. Out of the package, it feels impressively light and flexible — like a soft balloon made from durable material. The build quality is excellent: welded seams, no chemical smell, and the cap design looks well-engineered for quick access. It’s small enough to fit in a vest pocket or even the waistband of running shorts without bouncing. Real Experience: On the trail, this little flask shines. The soft body collapses as you drink, so there’s no sloshing sound or wasted space — a small detail that makes a big difference on long runs. The bite valve delivers just the right flow, and the wide mouth makes refilling gels or electrolytes easy. Cleaning is straightforward, and the material doesn’t retain odors even after several uses. I’ve dropped it a few times on rocks, and it shows no signs of wear. The only con: if you overfill it, it can be a bit tricky to close tightly until you get used to it. Helpful Conclusion: Perfect for runners, cyclists, and hikers who want a reusable, ultralight way to carry nutrition or hydration. It’s durable, leakproof, and folds down to almost nothing when empty — ideal for minimalist setups. I’d definitely buy another one in a larger size for longer runs.

Great size — approximately the equivalent of 3 gels. Valve is secure so no leaking. My favorite is to make an espresso-maple syrup gel for endurance races. 40ml espresso, 110ml organic maple syrup (Costco). I usually ride with two flasks for a 4 hr ride. Much easier to sip/consume without having to open gels while riding. Lastly, cleaning is easy.

I use this when running long distances and the only issue I have with it is liquid spills out every time I open the top.

These are really difficult to use and/or defective. Also the size really isn’t great for water which is what I wanted them for—my bad. I can’t get the nozzle squirt area to operate correctly and ended up having to unscrew the entire lid which defeats the purpose.

Honestly i got tired of spending money on gels for training sessions. In one flask I can take the same amount of carbs as 3 gels for a fraction of the price. I love the variable closure for liquid or very viscous gels. It’s bulkier than 1 gel but not as bulky as 3 separate gels.

Been going strong for year, bought a 2nd for more volume for longer runs. Works great in my Naked brand running belt, one on each side. Tips: Don't completely full, leave just a 1-2 cm at top, squeeze air out then cap. Full/full and they can pop lid off if you like bend at waist and squeeze it. Other tip, I rinse and put in fridge, no grime. I generally just use water, but If I use electrolytes, I rince, the add 1-2 tbsp. of vinegar, squash around, rinse and fridge. I fyou want to air dry, I just slide it over a butter knife propped up to hold it open. No scum/smell/tastes in a year. Great price, good product, perfect for running belts/vest.

Everything they make is awesome and these are no different. Easy to wash, no leakage, perfect size for riding.

As described. Small enough to fit in pocket. Gives me three mouthfuls of liquid. But the plastic chemical smell is disgusting. And effects the taste of the liquid. I have washed it out numerous times and have left it without the lid on for over a week and even though the smell is not as strong it’s still there. I’m hoping with time it will eventually disappear.

A disaster of a product. The twist nozzle opens in the same direction as the screw cap lid itself, with the same amount of strength - this leads to me unscrewing the entire lid off each time I do it single handedly on my bike, getting gel spilling all over my bike. Not recommended unless you like gel all over your body. Or if you don't mind using a gel bottle that needs 2 hands to open.

all good

Excelente, fácil de agarrar y llevar.

ジェルを複数持って走る人には必須のアイテムです。 フルマラソン時、ジェルで消化不良を起こしてましたが、この商品に、ジェル3個を水で薄めて入れてたところ、消化不良が起きなくなりました。 1点だけ、素材が柔らかいので、蓋を開ける際、少し注意が必要。 蓋の横の硬い部分を持って開ければ、吹き出すことなく開けれます。