--- product_id: 443254213 title: "Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack" brand: "hydrapak" price: "$4.78" currency: USD in_stock: true reviews_count: 2 url: https://www.desertcart.us/products/443254213-hydrapak-ultraflask-collapsible-soft-flask-water-bottle-for-hydration-pack store_origin: US region: United States of America --- # SpeedFill cap for rapid refills collapsible, shrinks as you drink 500ml ultra-light capacity Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack **Brand:** hydrapak **Price:** $4.78 **Availability:** ✅ In Stock ## Summary > 💦 Stay light, stay fast, stay hydrated—no excuses. ## Quick Answers - **What is this?** Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack by hydrapak - **How much does it cost?** $4.78 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/443254213-hydrapak-ultraflask-collapsible-soft-flask-water-bottle-for-hydration-pack) ## Best For - hydrapak enthusiasts ## Why This Product - Trusted hydrapak brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **SpeedFill Cap:** One-motion quick open/close for effortless aid station refills. - • **Collapsible Design:** Soft TPU material shrinks as you drink, minimizing bulk and sloshing. - • **Bounce-Free Stability:** Fits snugly in vests & packs to prevent chafing and movement. - • **Ultra-Light Hydration:** Weighs just 41g—barely there, always ready. - • **Customizable Versatility:** Choose between straw or bite valve for your hydration style. ## Overview The HydraPak UltraFlask 500ml is a collapsible, ultra-lightweight soft flask designed for runners and outdoor enthusiasts. Made from durable TPU and silicone, it fits seamlessly into hydration vests and packs with bounce-free stability. Featuring a quick-access SpeedFill cap and customizable valve options, it ensures rapid refills and personalized hydration on the go. Backed by a beyond lifetime warranty, it’s built to keep pace with your toughest adventures. ## Description Part of our ultra-light series, the 500 ml is so light, you might forget you brought it. Weighing in at just over an ounce, it’s optimal hydration, no matter what kind of runner you are. Its soft material conforms to most pockets & shrinks as you drink to minimize water movement. Topped with our SpeedFill cap for quick aid station refills and is ready for use with or without the tube. Ultra lightweight, ultra useful Included in the package: UltraFlask 500ml Flask SpeedFill Cap Drink Tube Bite Valve Basic Care & Use Instructions Specifications: Capacity: 500 mL / 17 fl oz Weight: 41 g / 1.4 oz Dimensions: 186 mm x 58 mm / 7.3 in x 2.3 in Material: TPU, PP, Silicone, POM ## Features - HYDRATION VEST COMPATIBLE: Fits easily in most hydration vests, belts 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. - PERFECT FOR AID STATIONS:UltraFlasks are equipped with our SpeedFill Cap designed for quick and easy refilling at aid stations. A side tab pops open the cap in one motion and snaps shut with a click. - CUSTOMIZABLE CAP: Built for versatility, the UltraFlask comes with a 42mm customizable cap. Choose between straw or bite valve. - BEYOND LIFETIME WARRANTY: If you experience any issue, we’ll repair or replace the item for free. Whatever it takes to keep your adventure going. ## Technical Specifications | Specification | Value | |---------------|-------| | Age range | Adult | | Color | Malibu Blue | | Size | 500ml Speed - 2 Pack | | Style | 500ml Speed - 2 Pack | | Shape | Round | | Material type | Silicone, Thermoplastic Polyurethane | | Number of items | 2 | | Features | Collapsable, Straw | | Usage | Running, hiking, outdoor activities | | Sport | Running | | Volume capacity | 500 Millilitres | | Included components | 2 Pieces Collapsible 500ml SoftFlask, Cap and Straw | | Brand | HydraPak | | Department | Unisex-Adult | | Manufacturer | HydraPak | | Item model number | 20222 | | Product Dimensions | 5.08 x 5.08 x 21.59 cm; 200 g | | ASIN | B09S8RZB94 | ## Product Details - **Brand:** HydraPak - **Material:** Silicone, Thermoplastic Polyurethane - **Bottle type:** Collapsible Water Bottle - **Colour:** Malibu Blue - **Capacity:** 500 Millilitres ## Images ![Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack - Image 1](https://m.media-amazon.com/images/I/6143Thp1XTL.jpg) ![Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack - Image 2](https://m.media-amazon.com/images/I/71M2AWJuX6L.jpg) ![Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack - Image 3](https://m.media-amazon.com/images/I/81K0u5i0OmL.jpg) ![Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack - Image 4](https://m.media-amazon.com/images/I/81iHjTiZo0L.jpg) ![Hydrapak UltraFlask - Collapsible Soft Flask Water Bottle for Hydration Pack - Image 5](https://m.media-amazon.com/images/I/71kZ8zzQ-QL.jpg) ## Questions & Answers **Q: I have a bunch of these but they tend to get a bit slimy inside. What is the best way to clean them?** A: 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 **Q: Will they take a Katadyn BeFree filter?** A: 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. **Q: osprey duro 15, will it fit the front pockets?** A: 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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good soft flasks *by Z***E on 18 May 2025* Works well, as advertised ### ⭐ Missing Items *by A***R on 10 April 2025* Wrong item sent (only one flask not two) and straw was missing. ## Frequently Bought Together - HydraPak UltraFlask Speed (500ml or 600ml) - Collapsible Soft Flask Water Bottle for Hydration Vests and Running Packs with Easy Open Cap - HydraPak Velocity Hydration Reservoir (1.5L or 2L), Slim Profile Water Bladder, Self-Sealing Bite Valve, Leak Proof, Reversible, Dishwasher Safe - HydraPak Velocity IT (1.5L or 2L Hydration Reservoir) - Insulated Water Bladder/Reservoir for Hydration Pack – Self-Sealing Bite Valve, Leak Proof and Dishwasher Safe --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/443254213-hydrapak-ultraflask-collapsible-soft-flask-water-bottle-for-hydration-pack](https://www.desertcart.us/products/443254213-hydrapak-ultraflask-collapsible-soft-flask-water-bottle-for-hydration-pack) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*