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USWE 0,5L Softflask Rocket in dark gray with wide mouth opening and bite valve, featuring white USWE lightning bolt logo on collapsible TPU body designed for trail running hydration vests.

0,5L Softflask with wide opening, Rocket
$26.99

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WHY WE DESIGNED IT:

The 0.5L Softflask with wide opening, Rocket, is built for fast refills at aid stations when every second counts, featuring a wide mouth that handles ice, electrolyte mix, and chaotic race-day moments without the spill. This ultra-durable TPU soft flask collapses as you drink to kill bounce and sloshing, fits perfectly in your vest pockets, and handles everything from frozen pre-race prep to hot water fills in winter.

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Size guide - 0,5L Softflask with wide opening, Rocket

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Features & Specs

Specifications

Full Description

Design & Action

Sick of fumbling with tiny bottle openings when you're gassed at mile 20? The 0.5L Softflask with wide opening, Rocket, is built for those chaotic aid station moments when every second counts. This flexible flask for running is designed for trail runners, marathoners, and endurance junkies who need to refill fast, drink hard, and keep moving. The wide mouth opening means you can dump in ice, electrolyte mix, or whatever fuel you need without spilling half of it on your shoes.

Tech & Specs

  • 500ml capacity: Enough hydration for short runs or quick refills during long races without the bulk
  • Ultra-durable TPU construction with RF welded seams: This soft water bottle for trail running takes a beating and keeps on squeezing
  • Wide mouth opening: Easy to fill hydration flask design lets you reload at aid stations in seconds, even with shaky hands
  • Temperature versatile: Freeze it for hot weather running or fill with hot water up to 60°C (140°F) for winter adventures
  • 100% BPA and PVC free: Safe, reliable hydration that won't mess with your system

Fit & Kit

This USWE soft flask fits perfectly in the front pockets of your hydration vest or running pack, collapsing down as you drink to minimize bounce and sloshing. The bite valve delivers smooth, controlled flow for long races without choking you or dribbling everywhere. Compatible with USWE Vest VST models and most hydration pack accessories, this replacement bottle for running vest setups is a no-brainer for anyone serious about their hydration game. Rinse it out after each run, let it air dry, and it's ready to roll again.

FAQ

Can I freeze this soft flask for ultramarathons or hot weather runs? +
Absolutely. Toss it in the freezer before your run and it'll keep your water cold for hours. Just don't fill it all the way to the top so it has room to expand.
Does this flask fit in the front pockets of other brands' running vests? +
It's designed for USWE Vest VST models, but the 500ml size and collapsible design means it'll fit most hydration vest front pockets. Check your vest's pocket dimensions to be sure.
How do I clean the bite valve after long races? +
Pull the bite valve off the cap, rinse it under warm water, and let it air dry. For deeper cleaning, soak it in warm soapy water and give it a good squeeze to flush out any gunk.
Is the wide mouth opening big enough to fit ice cubes? +
Yep. The wide opening is built for quick refills at aid stations, so standard ice cubes drop right in without a fight.
Can I use this flask for cycling or ski touring, or is it just for running? +
It works for any sport where you need lightweight, collapsible hydration. Cyclists, ski tourers, and backpackers all use it. Just make sure your pack or vest has a compatible pocket.