Flexible TPU body
Food-grade BPA-free TPU is soft and collapsible. The flask compresses as you drink to reduce empty space and water movement.
HECHZSO / 03 — 500 ML COLLAPSIBLE SOFT FLASK
Flexible water.
Ready for the vest.
A 500 ml / 17 fl oz flexible flask for running vests, packs and belts with compatible bottle pockets. It compresses as you drink, reducing the space a rigid bottle would keep taking up; the bite valve supports quick sips, and the hook gives you a practical way to hang it after rinsing.
- 500 ml17 fl oz capacity
- 35.4 gListed weight per flask
- Flexible bodyCompresses as you sip
LISTING OPTIONS
Single-flask and 2-pack quantities are shown on the listing. Confirm your choice on Amazon.
Options, pricing and availability may change. Confirm the selected size and pack quantity on the current listing.
AT A GLANCE
Know what you are carrying.
- CAPACITY
- 500 ml / 17 fl oz each
- WEIGHT
- 35.4 g each (listing)
- PACK OPTIONS
- Single flask or 2-pack
- MATERIAL
- Food-grade BPA-free TPU
03 / FLEXIBLE HYDRATION
Sip. Compress.
Pack down.
A soft flask changes shape as the water level drops, making it a natural choice for compatible running vests, packs and belts. The bite valve keeps drinking close at hand; the dust cap helps protect the mouthpiece between uses.
After a run, rinse it and use the built-in hook to hang it upside down to dry. Follow the care guidance: the listing says it is not for freezing or dishwasher use.
Less bottle to manage as the route unfolds.
DESIGNED FOR PACK POCKETS
Flexible by nature.
Capacity markings, a compressible body and a hang-dry hook make the flask easier to understand from first fill through post-run care.
HECHZSO / OUR APPROACH
Hydration designed around the way you move.
DESIGNED AROUND REAL USE
Fit and care matter
Flexible hydration for compatible running vest pockets, packs and belts. The body compresses as the water level drops, while capacity markings help you see how much remains.
Bite valve + dust cap
The high-flow bite valve supports hands-free drinking; the dust cap helps protect the mouthpiece outdoors.
Metal hang-dry hook
A built-in metal hook lets you hang the flask upside down after rinsing. Capacity markings are printed on the body.
CUSTOMER QUESTIONS
Good to know.
Straight answers about capacity, fit, use and care.
Does the listing include one flask or two?
Both quantity options are shown: single flask and 2-pack. Confirm the package quantity selected on Amazon before checkout.
Will it fit my running vest or belt?
The listing says it fits most running vest pockets, hydration packs and running belts. Measure your pocket opening and depth and compare them with the approximate flask dimensions before buying.
Does it collapse as I drink?
Yes. The flexible TPU body compresses as the water level drops, helping reduce empty space and sloshing.
How do I clean and dry the flask?
Rinse it after use and hang it upside down using the built-in metal hook to dry. The listing says it is not dishwasher-safe; follow the current care instructions.
Can I put it in the freezer?
The listing gives a use range of 32–140°F (0–60°C) and says the flask is not suitable for freezing. Avoid freezing it.
What are the size and weight?
The listing states approximately 10.8 × 3.9 inches (27.5 × 10 cm) and 35.4 g per flask. These are approximate product specifications.