The Guardian's testers have evaluated a range of cool boxes and bags to help you stay refreshed during the UK summer. After rigorous testing, the overall winner is the Yeti Hopper M20 Backpack, praised for its exceptional ice retention and rugged design. It kept ice frozen for over 24 hours in moderate conditions and is fully waterproof, though it comes with a high price tag.
Top Pick: Yeti Hopper M20 Backpack
This backpack-style cooler impressed with its durability and insulation. It fits up to 20 cans and has a leakproof zipper. The only downside is its weight when full and the premium cost, but for those who need reliable cold storage for day trips or picnics, it's a worthy investment.
Best Budget Option: Arctic Zone Titan Deep Freeze
For a more affordable choice, the Arctic Zone Titan Deep Freeze offers great value. It kept items cold for up to 12 hours and has a reflective interior to enhance insulation. The bag is lightweight and easy to carry, making it ideal for short outings.
Best for Families: Igloo Maxcold 50 Can Cooler
This large cooler bag can hold up to 50 cans and features a thick insulation layer. Testers found it kept drinks cold for a full day at the beach. The handles are sturdy, and it folds flat when not in use, but it can be bulky when full.
Best Hard Cool Box: Coleman 48-Can Xtreme
For those who prefer a hard-sided cooler, the Coleman 48-Can Xtreme performed well, maintaining ice for up to three days in shaded conditions. It has a robust build and a drain plug for easy cleaning, but it is heavy and not suitable for long carries.
Best Insulated Tote: M&S Collection Insulated Cool Bag
Marks & Spencer's insulated tote bag is stylish and functional. It kept items cool for about 6 hours and is perfect for grocery runs or short trips. The bag is affordable and comes in several colours, but the insulation is not as effective as premium options.
Testing Methodology
The Guardian's team tested each product by filling them with ice packs and ambient temperature drinks, then monitoring temperature changes over several hours. They also evaluated portability, durability, and ease of cleaning. All products were tested in real-world conditions, including car journeys and outdoor events.
Buying Guide
When choosing a cool box or bag, consider the duration you need it to stay cold, the capacity required, and whether you need a backpack, tote, or hard cooler. Soft-sided bags are lighter and easier to store, while hard coolers offer superior insulation for longer trips. Price is also a factor, with premium brands like Yeti offering the best performance but at a higher cost.
