500ml Soft Flask
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Quantity
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500ml Soft Flask delivers lightweight hydration that packs small and moves fast
What Our Gearhead® Experts Are Saying:
“I always keep a couple of these in my vest for races or long trail runs. They’re light, collapse as you drink, and the 500ml size is perfect for aid stations or fast fill-ups on the go. Fits seamlessly in my running vest pockets.”
When staying light and moving fast is the goal, the 500ml Soft Flask makes hydration effortless. Designed to work seamlessly with running vests, handhelds, or as a backup bottle in your pack, this soft-sided flask holds just enough water for those high-output stretches between fill-ups. As you drink, the flask compresses to minimize bounce and bulk, making it a favorite for race day and long-distance training.
The flexible TPU construction is durable enough for everyday trail use yet light enough to disappear when empty. Whether you're stocking aid station drop bags or upgrading your vest setup, this flask is built to move as efficiently as you do.
Details
- Soft 500ml hydration flask designed for trail running and fast hiking
- Compatible with most vest pockets and handheld carriers
- Collapsible design compresses as you drink to reduce slosh and bounce
- Lightweight TPU construction is durable and easy to pack
- BPA-free and food-safe for clean, worry-free hydration
- Wide mouth for quick refills and easy cleaning
- Ideal for trail runners, endurance athletes, and fastpackers
- Item #OSPZ1DZ
- Material
- TPU film
- Volume
- 17fl oz
- Lid
- bite-valve
- Dimensions
- 9 x 4 x 1in
- Claimed Weight
- 1.2oz
- Activity
- backpacking, hiking
- Manufacturer Warranty
- lifetime
Reviews
Q&A
What do you think about this product?
Overall Rating
4.5 based on 11 ratings
Review Summary
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Selecting an option will reload the available reviews on the pageJuly 16, 2025
Tasted of plastic
Just tasted of plastic every time I tried to drink. Nasty
Originally reviewed on osprey-emea
March 5, 2025
This little bottle is a
This little bottle is a great addition to my long run kit. I like that it is undyed plastic so it’s easy to clean. I used this flask for my electrolytes because I knew I could clean it. There isn’t an on/off for the valve but it didn’t leak even after stuffing it into a tight pocket.
Originally reviewed on Osprey
February 23, 2025
Love this , fits great
Love this , fits great in side pouch of my day pack
Originally reviewed on Osprey
November 4, 2024
I’ve used these on a
[This review was collected as part of a promotion.] I’ve used these on a few long runs now and I like them quite a bit. The only issue I have is that when they are almost empty they don’t want to stay in their pockets on my vest. I’m not sure if it’s the vest design or the bottle. It is also only a tiny issue. I just pull the retainer strap off and tuck them down in their pocket and go on with my run.
Originally reviewed on Osprey
September 29, 2024
I love its compactness and
[This review was collected as part of a promotion.] I love its compactness and ease of use. Perfect for short hikes and bike rides.
Originally reviewed on Osprey
September 26, 2024
They’re awesome, and glad I
[This review was collected as part of a promotion.] They’re awesome, and glad I can use them with my vest. Hope they’re life guaranteed as all your products, knowing that they will las for ever!
Originally reviewed on Osprey
September 6, 2024
I like the compaction on
[This review was collected as part of a promotion.] I like the compaction on it. When I am done I can make it smaller than my other squeeze bottles, but it would be nicer in a larger size.
Originally reviewed on Osprey
August 14, 2024
I like this flask as
[This review was collected as part of a promotion.] I like this flask as an extra back up when out on mountain bike in the mountains. Fits perfect in a long cozy to keep it cooler. Easy to drink from and rolls up nicely in pocket so I won’t lose it!
Originally reviewed on Osprey
May 29, 2024
Expensive for what they are
[This review was collected as part of a promotion.] Expensive for what they are but work great. Don’t leak, take the first sip of air out and they don’t slosh.
Originally reviewed on Osprey
November 29, 2023
work great for skiing
I don't find these useless at all. I've been using the red/black version of these for a few years for lift served and bc skiing. Easy to stash in a pocket/pack, no frozen hose, never had a leak even when skiing hard and the occasional tumble slamming the pocket it was in.
Originally reviewed on Osprey
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