---
product_id: 280650536
title: "(2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz)"
brand: "energy flask"
price: "£16.86"
currency: GBP
in_stock: true
reviews_count: 11
category: "Energy Flask"
url: https://www.desertcart.co.uk/products/280650536-2-bottles-small-semi-rigid-easy-to-clean-refillable-gu
store_origin: GB
region: United Kingdom
---

# 110ml compact capacity wide mouth for easy cleaning reusable & eco-friendly (2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz)

**Brand:** energy flask
**Price:** £16.86
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your endurance, ditch the mess, and join the eco-fuel revolution!

## Quick Answers

- **What is this?** (2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz) by energy flask
- **How much does it cost?** £16.86 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/280650536-2-bottles-small-semi-rigid-easy-to-clean-refillable-gu)

## Best For

- energy flask enthusiasts

## Why This Product

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

## Key Features

- • **Eco-Smart Choice:** Reusable, PVC-free flask reduces single-use packet waste and saves you money.
- • **Fuel on Your Terms:** Refillable 110ml flask lets you customize your energy gel or DIY fuel anytime, anywhere.
- • **Compact & Ready to Go:** Slim 4" semi-rigid design fits perfectly in cycling jerseys, running belts, and hydration packs.
- • **Mess-Free Performance:** Wide mouth and secure cap eliminate sticky gel packet struggles and waste.
- • **Effortless Maintenance:** Dishwasher safe and easy to clean for hassle-free post-workout care.

## Overview

The Energy Flask is a 110ml semi-rigid, refillable gel bottle designed for endurance athletes. Its compact, lightweight design fits easily into sports gear pockets, while the wide mouth and secure cap ensure easy filling, cleaning, and mess-free fueling. Made from BPA/PVC-free materials and dishwasher safe, it supports DIY energy gels and reduces single-use waste, making it the smart, sustainable choice for runners, cyclists, triathletes, and outdoor adventurers.

## Description

Energy Flask is a refillable semi-rigid gu flask for endurance sports used to carry energy gel, DIY energy fuel, hydration mix, pickle juice or water. These reusable, small gel bottle are simple, fast, and convenient to use and provide a better way to fuel your next workout or adventure. Perfect hammer flask for running, cycling, triathlons, hiking, climbing, snow sports, bike packing, or any endurance sports activity. Compact design makes this gel bottle easy to fit where you need them to: cycling jersey pocket, flipbelt, frame or bar bag, hip pack, fuel belt or hydration pack.

Review: Great as a Triathlon (or running race) Flask! - I am a Triathlete who does mostly Olympic and Half Ironman Distance races. I have bought a bunch of flasks trying to find the best for gels and liquids for my bike storage and a my TriSuit pockets. This is the best I have found. Size is great (fits all my trisuit pockets and my Tribike built in storage container). Great top (closes tightly/no leaking, easy to open with teeth and close), gets liquids out great. Slides in and out of pockets great. The only thing I would have changed is not having the base of it so firm (hard to squeeze out last bits of gels). However, compared sooo favorably to all others I tried. The rest had many flaws (too big, doesn't close well, hard to consume while running, material sticks/rather than slides into pockets etc). I have bought 8 of these so far and just ordered 6 more (want to make sure I have a bunch if they for some reason become unavailable.
Review: Ideal if your energy gel is maple syrup - .. or same consistency. I originally tried using Gu branded gel flasks, but the twist top was not so useful when cycling (I use these for endurance MTB & gravel cycling events). Holding the flask with one hand and trying to twist open it with my teeth while pedaling, the entire cap would start to twist off making an awful mess of gel/syrup all over my hand and the bike. These flasks are much more convenient. The pull-top opening is much easier and trouble-free; just a quick pull to pop it open and give a quick squeeze and you're good to go. Then snap it closed with your thumb (or pop it against your helmet) and it's sealed and ready to stow away, leak free. Your only other consideration is what you use for energy gel. I probably wouldn't use these for GU gel, honey or anything with a similar (thicker) viscosity. I'm not sure how well those would flow through the cap opening. Personally I use organic maple syrup for my energy gel and it's the perfect consistency; no matter the temperature it's thin enough to flow.

## Features

- CONVENIENT – Small gel flask that is easy to use and easy to clean. No more struggling with individual gel packets during your workouts or races. These gel flasks allow you to consume as much or as little as you need, as often as you want.
- CLEAN – Eliminate sticky messes and carrying empty gel packet waste.
- EASY – Simple to open/close with secure cap. Unlike other gu bottle, Energy Flask has a wide mouth that makes it easy to fill and simple to clean (dishwasher safe). Molded finger holds on one side for secure grip.
- SAVE $$$ and REDUCE WASTE - Can use do-it-yourself (DIY) sports fuel. Create your own gel mixtures with maple syrup, honey, coffee, Nutella, etc. Better for the environment by eliminating individual gel packets.
- COMPACT and BPA/PVC FREE - Unlike other larger gel bottles, Energy Flask is only about 4" tall and holds 110 ml (3.5oz) capacity. Semi-rigid. Squeezable. Easily fits in small places like cycling jersey pocket, bike frame bags, running fuel belt, hip pack, ski pack, hiking bag, summit pack, or hydration pack.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08LHN3WMC |
| Additional Features | Dishwasher Safe,Wide Mouth |
| Age Range Description | Adult |
| Best Sellers Rank | #19,481 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #12 in Camping & Hiking Hydration Flasks |
| Bottle Type | Sports Bottle |
| Brand | Energy Flask |
| Brand Name | Energy Flask |
| Capacity | 110 Milliliters |
| Color | White |
| Container Type | Bottle |
| Customer Reviews | 4.5 out of 5 stars 212 Reviews |
| Finish Types | Polished |
| Item Dimensions W x H | 4.3"W x 4.3"H |
| Item Type Name | Gel flask |
| Manufacturer | Energy Flask |
| Manufacturer Part Number | 001 |
| Material | Plastic |
| Material Type | Plastic |
| Material Type Free | Polyvinyl Chloride (PVC) Free |
| Model Name | Energy Flask |
| Number of Items | 2 |
| Number of Packs | 2 |
| Product Care Instructions | Dishwasher Safe |
| Recommended Uses For Product | Endurance sports nutrition, Running, Cycling, Triathlons, Hiking, Climbing, Snow sports, Bike packing |
| Reusability | Reusable |
| Shape | Rectangular |
| Special Feature | Dishwasher Safe,Wide Mouth |
| Specific Uses For Product | Endurance sports nutrition, Running, Cycling, Triathlons, Hiking, Climbing, Snow sports, Bike packing |
| Sport Type | Climbing, Cycling, Hiking, Running |
| Style Name | Sporty |
| Theme | Sports Nutrition |
| Unit Count | 2 Count |

## Product Details

- **Brand:** Energy Flask
- **Material:** Plastic
- **Bottle Type:** Standard Bottle
- **Capacity:** 110 Milliliters
- **Special Feature:** Dishwasher Safe,Wide Mouth

## Images

![(2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz) - Image 1](https://m.media-amazon.com/images/I/61wwrfHa8wL.jpg)
![(2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz) - Image 2](https://m.media-amazon.com/images/I/31vXDuLD-8L.jpg)
![(2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz) - Image 3](https://m.media-amazon.com/images/I/61-YNHm76lL.jpg)
![(2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz) - Image 4](https://m.media-amazon.com/images/I/915g8AB+p1L.jpg)
![(2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz) - Image 5](https://m.media-amazon.com/images/I/81eHEDbw9gL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great as a Triathlon (or running race) Flask!
*by M***R on June 1, 2021*

I am a Triathlete who does mostly Olympic and Half Ironman Distance races. I have bought a bunch of flasks trying to find the best for gels and liquids for my bike storage and a my TriSuit pockets. This is the best I have found. Size is great (fits all my trisuit pockets and my Tribike built in storage container). Great top (closes tightly/no leaking, easy to open with teeth and close), gets liquids out great. Slides in and out of pockets great. The only thing I would have changed is not having the base of it so firm (hard to squeeze out last bits of gels). However, compared sooo favorably to all others I tried. The rest had many flaws (too big, doesn't close well, hard to consume while running, material sticks/rather than slides into pockets etc). I have bought 8 of these so far and just ordered 6 more (want to make sure I have a bunch if they for some reason become unavailable.

### ⭐⭐⭐⭐⭐ Ideal if your energy gel is maple syrup
*by J***C on October 8, 2024*

.. or same consistency. I originally tried using Gu branded gel flasks, but the twist top was not so useful when cycling (I use these for endurance MTB & gravel cycling events). Holding the flask with one hand and trying to twist open it with my teeth while pedaling, the entire cap would start to twist off making an awful mess of gel/syrup all over my hand and the bike. These flasks are much more convenient. The pull-top opening is much easier and trouble-free; just a quick pull to pop it open and give a quick squeeze and you're good to go. Then snap it closed with your thumb (or pop it against your helmet) and it's sealed and ready to stow away, leak free. Your only other consideration is what you use for energy gel. I probably wouldn't use these for GU gel, honey or anything with a similar (thicker) viscosity. I'm not sure how well those would flow through the cap opening. Personally I use organic maple syrup for my energy gel and it's the perfect consistency; no matter the temperature it's thin enough to flow.

### ⭐⭐⭐⭐ Great alternative to energy gel packaging
*by C***F on April 6, 2024*

I really loved this idea because I hate how energy gels are packaged. They cut the side of my mouth, they are hard to open when you are running, and they become a sticky mess no matter how careful you are. These flasks are made of a pretty hard plastic, but they are actually very easy to squeeze. I was able to put two gels in each of them, and I mixed the gels with a little bit of water. I also used them with liquid energy gels which didn't need extra water. I was surprised at how easy they are to clean and they are very light. They are easy to open and close and fit in my pocket easily. I did have one major fail with them during an actual marathon, though. I put them in a pocket where they were pretty free to move around, and the cap came unscrewed and dumped the whole bottle of chocolate gel down my leg. My mistake, but make sure the cap is screwed on tight and the nozzle is closed before you go running.

## Frequently Bought Together

- (2 Bottles) Small, Semi-Rigid, Easy-to-Clean, Refillable Gu Flask for Sports Nutrition Liquid Energy Gel Flask - Cycling Flask, Running Flask, Triathlons, Marathons. 110ml (3.5oz)
- FITLY Soft Flask - Shrink As You Drink Soft Water Bottle for Hydration Pack - Folding Water Bottle Ideal for Running, Hiking, Cycling, Climbing & Rigorous Activity
- HydraPak SoftFlask - Collapsible Nutrition Flask (150ml or 250ml) - BPA Free, Easy Open Cap, Foldable, Lightweight

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-02*