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All in all, we spent hundreds of hours combing through thousands of user reviews to put together a comprehensive list of the best soft flasks running on the market. We then delved into these soft flasks running further and put together detailed reviews so that you can easily pick the best soft flasks running for your needs.

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Best soft flasks running reviews

1. Salomon Soft Flask, 250ml/8-Ounce, Clear

Feature

This soft flask compresses as you drink from it, letting you know how much you have left to drink.
Minimal construction and shrink while you drink means it gets lighter as you Run!
Super fast and accessible, a light squeeze gives ample hydration, without leaking.

2. GU Energy Refillable Flask for Sports Nutrition Energy Gel, 5.5-Ounce, Blue

Feature

Fill GU Energy flask with energy Gel's 15-serving pouches
Holds 5 servings of energy Gel
Soft flask with high-flow nozzle
Includes marks on the back for measurement
Reusable container allows for refilling

3. Osprey Hydraulics 250ml Soft Flask

Feature

Includes both standard sport cap and bite valve with extension hose options
All parts are BPA-free, phthalate-free, lead-free, guaranteed
All materials are certified food safe according to FDA and EU regulations
Offers 250ML of capacity
Dimensions 8.66h x 2.8w x 0d IN at .06 LBS

4. Osprey Hydraulics 500ml Soft Flask

Feature

Includes both standard sport cap and bite valve with extension hose options
All parts are BPA-free, phthalate-free, lead-free, guaranteed
All materials are certified food safe according to FDA and EU regulations.
Offers 500 ML of capacity
Dimension 7.76h x 4.25w x 0d IN. at .08 LBS

5. 2Pack of Foldable Sports BPA PVC Free Soft Running Water Kettle Soft Hiking Flask Hydration Bottle (500ml)

Feature

Capacity:250ml/500ml, Weight: 27g/33g
Material: BPA Free TPUSoft Flask with a straw
Package:2pcs 500ml Bottles with straws
Holds liquid with -40 to 100 temperature,
Soft bottle collapses as you drink to be almost weightless and compact to carry

6. Hydrapak SoftFlask 500ml - Collapsible Handheld Running Water Bottle Soft Flask - (500 ml/16 oz)

Feature

HANDHELD HYDRATION - Ultra light, designed for the minimalist runner, hiker, climber or fits in running vests or pack pockets.
COLLAPSIBLE WATER BOTTLE - Soft material conforms to your hand or pocket, and shrinks as you drink to reduce movement and pack away easily when empty.
EASY CARRY - Flexible hand strap for comfortable carrying designed to prevent chafing.
LOCKING CAP - High-flow bite valve auto-seals after each sip, eliminating annoying drips, and includes a twist locking cap for leakproof transport.
100% BPA & PVC FREE - No weird taste, and no unnecessary or harmful chemicals.
BEYOND LIFETIME WARRANTY - If you experience any issue, well repair or replace the item for free. Whatever it takes to keep your adventure going.

7. Hydrapak UltraFlask 500ml - Collapsible Soft Flask Water Bottle for Hydration Pack - (500 ml/16 oz) , Malibu Blue

Feature

HYDRATION VEST COMPATIBLE - Fits easily in most hydration vest, belt or pack pockets. Provides bounce-free stability and a flexible flask shoulder to prevent chafing.
COLLAPSIBLE FLASK- Soft material conforms to any pocket, and shrinks as you drink to reduce movement and pack away easily when empty.
ULTRALIGHT HYDRATION - Makes a great hydration addition or replacement for distance or trail running.
DURABLE - Made of abrasive-resistant TPU, high-flow bite valve auto-seals after each sip, eliminating annoying drips.
100% BPA & PVC FREE - No weird taste, and no unnecessary or harmful chemicals.
BEYOND LIFETIME WARRANTY - If you experience any issue, well repair or replace the item for free. Whatever it takes to keep your adventure going.

8. Azarxis Soft Flask Collapsible Water Bottle Running Soft Gel Flask Reservoir Handheld Folding TPU 250 500ml for Hydration Pack Hiking Cycling Climbing (500ml/16.9oz - 2 Pack with 2 Speed Straws)

Feature

SAVE SPACE: Only 33g (1.16oz). The collapsible water bottle is foldable and can be fold into a compact size (about 6 cm high). Such a space-saving soft water flask is mini potable convenient for your backpack pocket easy carry
EASY POUR & DRINK: With wide neck design, its convenient to pour water into the soft flask water bottle. When you want to drink water, just nibble the groove of the valve or use a straw directly without taking your running backpack off or stopping your running steps
OCCASION: The handheld water bottle is design for outdoor sports and daily life use. This sports gel flask is perfect for hydration, marathon, jogging, running, hiking, cycling, climbing, backpacking, traveling, travel, jog, run etc
FEATURE: The soft flask speed straw is hand held, ultra-light weight, anti, soft, small mini size, compact, easy carry, practical, simple to operate for children kids taking water to school or adult runner jogger use
ATTENTIONS: The softflask with straw/nozzle/tube is recommended for temperature 0-40 . The hand water bottles is unsuitable for colored drinks because its not easy to clean after 4 hours. Our water bottle comes with tea bags to remove the odor

9. FITLY FLASK150 - Soft Flask for Hydration Pack - Ideal for Running Hiking Cycling Climbing - Collapsible Water Bottle (5 oz - 150 ml)

Feature

No liquid bounce - Soft bite to quick flow
Shrinks as you drink
Leak resistant and rigid cap ring for easy refill
Light, durable, built to last - 100% BPA & PVC free
Ideal to drink on the go

10. CamelBak 12oz Quick Stow Flask

Feature

Bite valve self-seals after each drink, eliminating annoying drips
Empty flask collapses and folds ultra-compact to fit in most pockets
Cap is top-rack dishwasher safe
Hang flask upside down for easy drainage and drying

11. Sporteer Soft Hydration Flask - 500 ml - 2-Pack

Feature

100% BPA & PVC FREE - Water bottle is made of soft, collapsible TPU and soft silicone bite cap for tasteless hydration
COLLAPSIBLE AND LIGHT WEIGHT - Soft Flask compresses as you drink and folds easily when empty for bulk-free storage
EASY SQUEEZE DESIGN & SOFT SILICONE BITE CAP - Running flask fits comfortably in your hand and a light squeeze and soft bite on the cap is all that is needed for quick hydration with no leaking
DURABLE & FLEXIBLE MATERIAL - Flasks are made of TPU and are resistant to oil, grease and abrasion. RF welded seams ensure durability and no leaking
USA COMPANY, BRAND, SERVICE, & WARRANTY: Zero-Risk, 100% Satisfaction Guarantee and 1-Year Warranty

12. Hydrapak SoftFlask 150ml - Collapsible Trail Running Vest Soft Gel Flask Bottle - (150 ml/5 oz)

Feature

HYDRATION VEST COMPATIBLE - Makes a great nutrition or hydration addition or replacement to your running vest, pack, or belt pocket.
COLLAPSIBLE FLASK - Soft material conforms to any pocket, and shrinks as you drink to reduce movement and pack away easily when empty.
REFUEL ON THE GO - High-flow nozzle, designed to carry and dispense energy gels with an easy to clean nozzle. Holds 5+ servings.
DURABLE - Made of abrasive-resistant TPU, vest-pack fit provides bounce-free stability and a flexible flask shoulder to prevent chafing.
100% BPA & PVC FREE - No weird taste, and no unnecessary or harmful chemicals.
BEYOND LIFETIME WARRANTY - If you experience any issue, well repair or replace the item for free. Whatever it takes to keep your adventure going.

13. TRIWONDER TPU Soft Folding Water Bottles BPA-Free Collapsible Flask for Hydration Pack - Ideal for Running Hiking Cycling Climbing (450ml/15.22oz - Pack of 2)

Feature

SAFETY PROMISE -- Made of Food-Grade TPU material, 100% BPA & PVC Free, the soft water bottle is tasteless and eco-friendly. Flexible soft flask is ideal for marathon, running, cycling, etc
SPACE SAVING -- Soft water flask is compact and built for a long life for durable use. The running flask stands upright when it full and shrinks in the min volume while empty, no burden for sports
EASY DRINK -- Light squeeze gives ample hydration, high-flow bite valve auto-seals after each sip, without leaking. Convenient collapsible water bottle for daily, travel or outdoor sports
PRACTICAL -- The folding water bottle with straw/nozzle can be frozen and chilled overnight, easily get a refreshing beverage on the hot day. ( Recommended used temperature: 0 - 40 )
EASY CARRYING -- Ultra-light hand water bottle is easy to fold and carry. It can fit easily in most hydration vest, belt or pack pockets. Great soft hydration flask for men, women and kids

14. Salomon Soft Flask, 500ml, 17oz - 42mm

Feature

Hydrate On the Go: With a wide 42mm cap & high-flow valve, this 17 Oz/500 mL Soft Flask makes drinking, refilling & storage fast & easy, so you can stay focused on your running & the trail ahead.
Shrinks As You Drink: This flask has a thermomoulded bottom that makes it easier to slip in your pocket. Shrinking as you drink to limit water bounce, the flask lets you know exactly how much you have left.
Go the Distance: Whether you love daily road running in your neighborhood, an escape to a local trail, or something more rugged, Salomon makes hydration gear & accessories to help you rack up miles in comfort.
Time to Play: Whether you are into trail running, hiking, backpacking, or mountaineering, Salomon has shoes & gear for kids, men & women to help you conquer a new distance, personal record, or event!
Since 1947 Salomon has used our passion for outdoor sports & innovation to create progressive gear. Our road & trail running shoes, hiking sneakers, boots, & water shoes help make any path your own.

15. SOFT FLASK 250ml/8oz 28mm

Feature

Hydrate On the Go: Featuring an optimized grip & high-flow valve, this 8oz Soft Flask will help keep you hydrated on all your shorter runs, so you can explore, train and race in optimum conditions.
Shrinks As You Drink: This flask has a rapid access system that lets you drink with minimal pressure. Shrinking as you drink to limit water bounce, the flask lets you know exactly how much you have left.
Go the Distance: Whether you love daily road running in your neighborhood, an escape to a local trail, or something more rugged, Salomon makes hydration gear & accessories to help you rack up miles in comfort.
Time to Play: Whether you are into trail running, hiking, backpacking, or mountaineering, Salomon has shoes & gear for kids, men & women to help you conquer a new distance, personal record, or event!
Since 1947 Salomon has used our passion for outdoor sports & innovation to create progressive gear. Our road & trail running shoes, hiking sneakers, boots, & water shoes help make any path your own.

Conclusion

All above are our suggestions for soft flasks running. This might not suit you, so we prefer that you read all detail information also customer reviews to choose yours. Please also help to share your experience when using soft flasks running with us by comment in this post. Thank you!