---
product_id: 561944192
title: "- Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity"
brand: "fitly"
price: "$U1727"
currency: UYU
in_stock: true
reviews_count: 13
category: "Fitly"
url: https://www.desertcart.uy/products/561944192-soft-flask-shrink-as-you-drink-soft-water-bottle-hydration
store_origin: UY
region: Uruguay
---

# Shrinks as you drink - no bounce, no slosh 400ml capacity - just right hydration Ultra-lightweight & foldable - carry anywhere - Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity

**Brand:** fitly
**Price:** $U1727
**Availability:** ✅ In Stock

## Summary

> 💦 Stay hydrated, stay ahead — the flask that moves with you!

## Quick Answers

- **What is this?** - Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity by fitly
- **How much does it cost?** $U1727 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/561944192-soft-flask-shrink-as-you-drink-soft-water-bottle-hydration)

## Best For

- fitly enthusiasts

## Why This Product

- Trusted fitly brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Eco-conscious & safe:** Made from BPA & PVC-free thermoplastic polyurethane for guilt-free, reusable hydration.
- • **Versatile for all seasons:** Freezable design doubles as an ice pack to keep your drink cool or warm during winter runs.
- • **Ergonomic & leak-resistant:** Intelligent bite valve and flexible shape fit comfortably in hand and running vests.
- • **Compact & collapsible design:** Folds down to pocket size, perfect for runners, hikers, and cyclists on the go.
- • **Hydration that adapts to you:** Shrinks as you drink to eliminate bounce and slosh, keeping you light and focused.

## Overview

The FITLY Soft Flask is a 400ml collapsible water bottle designed for active professionals who demand lightweight, space-saving hydration. Made from BPA & PVC-free thermoplastic polyurethane, it shrinks as you drink to prevent sloshing and bounce, fitting seamlessly into running vests or pockets. Its leak-resistant bite valve and foldable design make it ideal for running, hiking, cycling, and climbing, while its freezable feature doubles as an ice pack for versatile use year-round.

## Description

Product description

Review: Convenient and Functional Soft Flask for Hydration - I recently purchased the FITLY Soft Flask - 12 oz (350 ml) for my running and hiking activities, and it has quickly become an indispensable part of my hydration setup. This soft flask offers a range of features that make it ideal for anyone needing a compact and efficient water bottle for outdoor activities. The design of the FITLY Soft Flask is excellent. The flexible material allows the bottle to shrink as you drink, reducing its size and minimizing sloshing. This feature is particularly useful during runs or hikes, as it ensures the flask remains compact and comfortable to carry. The flask is also lightweight, making it easy to include in my hydration pack or running vest without adding unnecessary bulk. The build quality is impressive. The flask is made from durable, BPA-free materials that are safe and long-lasting. Despite being soft and flexible, it feels sturdy and capable of withstanding regular use. The wide mouth design makes it easy to fill and clean, which is a significant advantage over some other hydration solutions. The cap and nozzle design are both practical and user-friendly. The cap seals tightly, preventing any leaks, and the nozzle allows for easy sipping on the go. It's simple to operate with one hand, which is perfect for maintaining momentum during activities like running or cycling. One of the standout features of this soft flask is its portability. When empty, it folds down to a small size that easily fits into a pocket or pack. This makes it convenient to carry as an extra water source or for use in situations where space is at a premium. Overall, the FITLY Soft Flask - 12 oz (350 ml) is a fantastic hydration solution for runners, hikers, cyclists, and outdoor enthusiasts. Its durable construction, practical design, and compact size make it a highly convenient and functional water bottle. I highly recommend this soft flask for anyone looking for an efficient and reliable way to stay hydrated on the go.
Review: AWESOME accessory to enhance my runs and keep me hydrated !! - When I first got into running long distance a few years ago I tried so many iterations of bottles - this by far is my favorite! It’s a solid design, holds just the right amount of water for me and fits in my run vest so I can be hands free, plus it doesn’t break the bank. I’ve also weirdly enough put warmer water in it for winter running! They last a long time - the spout makes the water easy to access and if I don’t bring my vest it’s light and hand sized, making it easy to carry. All in all great functionality. Also their customer service is super friendly and knowledgeable! Rare to have a person on the line AND one who’s friendly.

## Features

- HYDRATION ON THE MOVE: Our collapsible running soft flask is a compact and eco-friendly way to stay hydrated on the move! The soft water bottle is the perfect hydration tool for active individuals. Our soft water bottles for runners shrink as you drink, taking up minimal space and won’t slosh around, making it perfect for running, hiking, skiing or any rigorous activity.
- SHRINKS AS YOU DRINK: Our running vest water bottle is uniquely designed to shrink as you drink. This ensures the water doesn’t slosh around, bounce or rattle. The flexible design of our hydration flask shapes to your hand & body, meaning the soft flask is never unwieldy. Our flexible running flask features an intelligent bite valve & leak-resistant mouthpiece.
- STAY LIGHT ON YOUR FEET: FITLY’s collapsible flask is purposely lightweight ensuring your light on your feet and not weighted down by unnecessary bulk. At FITLY, reusability is deeply important to us, and our water bladder is no exception. Enjoy limitless use from our portable soft water bottle for running vest that is 100% BPA & PVC-free.
- HYDRATION ON THE MOVE: Our soft flask is specially crafted for vigorous activities such as running, hiking, cycling and climbing. The perfect sporting companion, take it everywhere with you! Our soft water bottle can be folded and tucked into your pocket or bag. Our soft flask water bottle comes in 5 size variations and are freezable so they can double as an ice pack.
- DIRECTIONS FOR USE: We recommend rinsing the flask thoroughly before first use. If you experience taste mix ½ a teaspoon of BAKING SODA with water, shake and rinse. Users have also found the following to be useful: Fill with MILK, shake, and rinse. Add drops of lemon. Let an orange peel or tea bag set in the flask for a couple of hours. To hydrate, simply softly bite the mouthpiece and press the soft flask and enjoy! The harder you press, the faster the liquid will exit.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BBG713HW |
| Additional Features | Folding,Lightweight,Valve |
| Age Range Description | Adult |
| Best Sellers Rank | #2,888 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #5 in Camping & Hiking Hydration Flasks |
| Bottle Type | Collapsible Bottle |
| Brand | FITLY |
| Brand Name | FITLY |
| Capacity | 400 Milliliters |
| Color | Black |
| Container Type | Bottle |
| Customer Reviews | 4.2 out of 5 stars 3,625 Reviews |
| Global Trade Identification Number | 07432112146117 |
| Included Components | F4B |
| Item Dimensions W x H | 2.76"W x 7.87"H |
| Item Weight | 0.03 Kilograms |
| Manufacturer | FITLY |
| Manufacturer Part Number | F4B |
| Material | Thermoplastic Polyurethane |
| Material Type | Thermoplastic Polyurethane |
| Material Type Free | BPA & PVC Free |
| Model Name | F4B |
| Model Number | F4B |
| Number of Items | 1 |
| Number of Packs | 1 |
| Product Care Instructions | Hand Wash Only |
| Recommended Uses For Product | Biking, Climbing, Running |
| Reusability | Reusable |
| Shape | Round |
| Special Feature | Folding,Lightweight,Valve |
| Specific Uses For Product | Running, Hiking, Cycling, Climbing |
| Sport Type | Climbing, Cycling, Hiking, Running |
| Style Name | sporty |
| Theme | Sport |
| Unit Count | 1.0 Count |

## Product Details

- **Bottle Type:** Collapsible Bottle
- **Brand:** FITLY
- **Capacity:** 400 Milliliters
- **Color:** Black
- **Material:** Thermoplastic Polyurethane

## Images

![- Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity - Image 1](https://m.media-amazon.com/images/I/61erFH-8JsL.jpg)
![- Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity - Image 2](https://m.media-amazon.com/images/I/71v+xOvxepL.jpg)
![- Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity - Image 3](https://m.media-amazon.com/images/I/61GF6AOJcxL.jpg)
![- Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity - Image 4](https://m.media-amazon.com/images/I/71Bl0gzTRhL.jpg)
![- Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity - Image 5](https://m.media-amazon.com/images/I/71P6kGHPutL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Convenient and Functional Soft Flask for Hydration
*by K***T on May 28, 2024*

I recently purchased the FITLY Soft Flask - 12 oz (350 ml) for my running and hiking activities, and it has quickly become an indispensable part of my hydration setup. This soft flask offers a range of features that make it ideal for anyone needing a compact and efficient water bottle for outdoor activities. The design of the FITLY Soft Flask is excellent. The flexible material allows the bottle to shrink as you drink, reducing its size and minimizing sloshing. This feature is particularly useful during runs or hikes, as it ensures the flask remains compact and comfortable to carry. The flask is also lightweight, making it easy to include in my hydration pack or running vest without adding unnecessary bulk. The build quality is impressive. The flask is made from durable, BPA-free materials that are safe and long-lasting. Despite being soft and flexible, it feels sturdy and capable of withstanding regular use. The wide mouth design makes it easy to fill and clean, which is a significant advantage over some other hydration solutions. The cap and nozzle design are both practical and user-friendly. The cap seals tightly, preventing any leaks, and the nozzle allows for easy sipping on the go. It's simple to operate with one hand, which is perfect for maintaining momentum during activities like running or cycling. One of the standout features of this soft flask is its portability. When empty, it folds down to a small size that easily fits into a pocket or pack. This makes it convenient to carry as an extra water source or for use in situations where space is at a premium. Overall, the FITLY Soft Flask - 12 oz (350 ml) is a fantastic hydration solution for runners, hikers, cyclists, and outdoor enthusiasts. Its durable construction, practical design, and compact size make it a highly convenient and functional water bottle. I highly recommend this soft flask for anyone looking for an efficient and reliable way to stay hydrated on the go.

### ⭐⭐⭐⭐⭐ AWESOME accessory to enhance my runs and keep me hydrated !!
*by E***. on July 16, 2025*

When I first got into running long distance a few years ago I tried so many iterations of bottles - this by far is my favorite! It’s a solid design, holds just the right amount of water for me and fits in my run vest so I can be hands free, plus it doesn’t break the bank. I’ve also weirdly enough put warmer water in it for winter running! They last a long time - the spout makes the water easy to access and if I don’t bring my vest it’s light and hand sized, making it easy to carry. All in all great functionality. Also their customer service is super friendly and knowledgeable! Rare to have a person on the line AND one who’s friendly.

### ⭐⭐⭐⭐ FITLY soft flask
*by A***0 on April 29, 2026*

I was searching around to look for a soft water flask for a chest pack. This 500ml flask was ideal for what I was looking for. It fits snug into the main compartments of the chest pack. I picked a soft flask over a hard bottle because as you drink your water, the shape of the flask shrinks as well, that way it doesn't take a lot of space.

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*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-06-05*