I have a bunch of these but they tend to get a bit slimy inside. What is the best way to clean them?

We suggest using Bottle Bright to help clean your soft flask. https://www.amazon.com/Bottle-Bright-Tablets-Biodegradable-Hydration/dp/B06XYCVDB9/ref=sr_1_4?hvadid=616928149387&hvdev=c&hvlocphy=9028880&hvnetw=g&hvqmt=e&hvrand=2863089430132798370&hvtargid=kwd-12313741154&hydadcr=9377_13604253&keywords=bottle+bright&qid=1693921708&sr=8-4

Will they take a Katadyn BeFree filter?

Haven't tried putting the filter in, but I carry the BeFree collapsable water filter and flask with me on most of my runs, hikes, and long gravel rides. It folds up easy and weighs nothing. I have been doing this for years. Very fortunate to live in Washington where there is clean, clear water on most of the trails & mountain gravel roads up here.

osprey duro 15, will it fit the front pockets?

Hi there! Our flasks and reservoirs will fit most running vests. Please see below dimensions and compare to that of your running vest to see if they are compatible. Dimensions: 7.3 x 2.3 in

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HydraPak UltraFlask Speed (500ml or 600ml) - Collapsible Soft Flask Water Bottle for Hydration Vests and Running Packs with Easy Open Cap

Product ID: 455084558

Details

Bottle Type
Collapsible
Brand
HydraPak
Capacity
500
Colour
Malibu Blue
Material
TPU PP/POM

⚡SpeedFill cap for rapid refills

🌀collapsible, shrinks as you drink

💧500ml ultra-light capacity

Description

💦 Stay ahead of the pack with hydration that moves as fast as you do!

BOUNCE FREE HYDRATION - Fits snugly in hydration vests and packs to eliminate bounce and chafing during your runs.
COLLAPSIBLE CONVENIENCE - Soft TPU material shrinks as you drink, reducing movement and stashing away effortlessly.
CUSTOMIZABLE VERSATILITY - Choose between straw or bite valve with the 42mm cap to match your hydration style.
SPEED FILL CAP TECHNOLOGY - One-motion pop-open cap lets you refill quickly at aid stations without missing a beat.
ULTRA LIGHTWEIGHT DESIGN - Weighs just 41g, so you barely notice it while powering through your miles.

The HydraPak UltraFlask Speed is a 500ml collapsible soft flask designed for runners and athletes who demand ultra-lightweight, bounce-free hydration. Made from durable TPU and equipped with a quick-access SpeedFill cap, it fits seamlessly into hydration vests and packs. Its innovative collapsible design shrinks as you drink, minimizing movement and maximizing comfort. BPA-free and backed by a beyond lifetime warranty, it’s the ultimate hydration companion for serious endurance athletes.

Specifications

ASIN	B09S8RZB94
Additional Features	Collapsable, Straw
Bottle Type	Collapsible Water Bottle
Brand Name	HydraPak
Capacity	500 Milliliters
Colour	Malibu Blue
Container Type	Soft Bottle
Customer Reviews	4.6 4.6 out of 5 stars (348)
Finish Types	Glossy
Included Components	2 Pieces Collapsible 500ml SoftFlask, Cap and Straw
Item Dimensions W x H	5.1W x 21.6H Centimeters
Item Type Name	500ml SoftFlask
Item Weight	84 Grams
Manufacturer	HydraPak
Manufacturer Part Number	20222
Material Type	TPU, PP/POM, Silicone
Material Type Free	BPA Free, BPS Free, PVC Free, BPF Free, DEHP Free
Model Name	UltraFlask Speed 500ml
Model Number	20222
Number of Items	2
Number of Packs	2
Product Care Instructions	Hand Wash Only
Recommended Uses For Product	Sports
Reusability	Reusable
Shape	Round
Specific Uses For Product	running
Sport Type	Running
Style Name	500ml - 2 Pack - With Drink Straws
Theme	Hydration Bottle, Athletic
UPC	834456002901
Unit Count	2.0 Count

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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