10 Best Collapsible Water Bottles 2025 in the UK

The SWIFTER Soft Flask 500ml is an ideal companion for those who enjoy running, hiking, or engaging in outdoor activities. Each pack includes two collapsible soft flasks, which are lightweight at 35 grams each, making them easy to carry without adding unnecessary weight. The 500ml capacity is sufficient for short to medium outings, offering enough hydration without the bulk of larger bottles.

A key feature is the high-flow bite valve that conveniently auto-seals after each sip, effectively preventing leaks and drips, which is particularly useful for active users who need a no-fuss solution. As you drink, the flask shrinks, reducing water bounce and providing added stability—a thoughtful design for runners and joggers who need a steady hydration source.

The flasks are made from BPA and PVC-free TPU material, ensuring that your hydration is safe and free from harmful chemicals. The durability of the material means the flask can withstand regular use, although users should note that the color may change over time due to water pH levels. This change does not affect the performance or safety of the flask. For convenience, these flasks are dishwasher safe, simplifying the cleaning process. However, while the collapsibility and lightweight nature are great strengths, some users may find the 500ml capacity limiting for longer adventures or particularly hot days. Additionally, the soft flask design might require some getting used to compared to rigid bottles. These flasks are best suited for individuals who prioritize portability and ease of use in their hydration solutions, particularly those engaged in high-motion activities.

The FITLY Soft Flask 350ml is an excellent choice for those who enjoy active lifestyles like running, hiking, cycling, and climbing. Made from lightweight plastic, it is designed to be both compact and eco-friendly, making it a convenient hydration solution while on the move. One of its standout features is its ability to shrink as you drink, ensuring the liquid doesn't slosh around, which is especially advantageous during vigorous activities.

In terms of capacity, it holds 350 milliliters, which might be sufficient for short activities but could require frequent refilling during extended excursions. The bottle's design includes an intelligent bite valve and a leak-resistant mouthpiece, making it easy to drink from without worrying about leaks. Additionally, the collapsible nature allows it to fit into small spaces when not filled, offering great portability.

The material used is BPA and PVC-free, highlighting its safety and reusability, which aligns well with FITLY's emphasis on environmental friendliness. However, being made of plastic, there's always a consideration of long-term durability compared to other materials like silicone or stainless steel. Ease of use is a strong point thanks to its simple biting and squeezing mechanism, allowing users to control the flow of water easily. Yet, some users might find the squeezing action a bit cumbersome during activities that require concentrated effort.

FITLY's bottle is also freezable, which is a neat feature for those who might want to use it as an ice pack. It's available in a sporty blue color and its compact dimensions make it suitable for adults who value minimalistic designs.

The HydraMate Collapsible Water Bottle is designed for convenience and practicality, making it an ideal choice for anyone engaged in outdoor activities or traveling. Made from PPE material, it is BPA-free, which ensures safety and a pure taste without any plastic aftertaste. The bottle's capacity is 750ml, which is ample for short excursions or daily use. Its lightweight design at only 34 grams enhances portability, allowing users to easily carry it around without adding much weight to their gear.

One of its standout features is its collapsible nature. When empty, it can be rolled up and clipped via the carabiner, making it extremely space-saving. This feature is particularly useful for travelers or hikers who need to save space. The bottle also includes a clear viewing window, providing users the ability to easily monitor water levels. It is versatile enough to be used for different types of cold beverages, including juices or even a bottle of wine, and can be stored in the fridge or freezer for added convenience.

This collapsible water bottle is particularly well-suited for travelers, festival-goers, and outdoor enthusiasts looking for a convenient, space-saving hydration solution. Its eco-friendly design and ease of use are great strengths, although users should be mindful of its durability in more demanding environments. The product has received positive customer feedback, averaging 4 out of 5 stars from 990 ratings, which indicates general satisfaction.