Best Passive Cool Box & Bags for Summer 2022 – Ideal for Beer, Picnics & Festivals
I don’t really go camping or have picnics, but recently my mother bought a canal boat, and her little fridge is far too small to keep all my beer cold. So I bought a cool bag from Amazon, hoping it would perform well enough that I don’t have to drink warm beer.
It worked brilliantly, and I now use it all the time, and I wonder why I haven’t bought one in the past. It works perfectly for any time you go to someone’s house with beer for a BBQ or party. I am always taking over people’s fridges, taking out a cold beer and replacing it with a less cold beer. Quite often, I have to resort to a short blast in a freezer. My cool bag avoids all this faff and frees up space for other people.
With the UK weather finally improving, many of us will be enjoying BBQs and picnics over the next couple of weeks, and I strongly recommend investing in a good quality cool box or bag.
Passive vs Electic Active Cool Boxes
I spent far too long obsessing if I should buy a normal passive insulated cooling box or invest in a much more expensive box that has active cooling.
An active cool box requires electricity to work and typically uses a thermoelectric Peltier cooler to work. These are typically powered by 12V and use the lighter socket in your car.
Thermoelectric coolers work by transferring heat between two electrical junctions. Voltage is applied across joined conductors to create an electric current. When the current flows through the junctions of the two conductors, heat is removed at one junction, and cooling occurs. Heat is deposited at the other junction.
The performance of these coolers is generally quite poor, but it is good enough to keep you food and drinks chilled for an extended period of time.
Pricing and quality range significantly. Amazon has 22L options for under £50.
There are also so some more advanced options, which have a compressor cooler and can run on 12/24V DC; these can cost several hundred.
Models with a compressor cooler work like a normal fridge, and the performance will be similar to a fridge, being able to easily cool down to 1-2°C, but the power consumption will be higher.
Cool Box vs Cool Bag
The other big question is if you should get a hard box or a bag. I ended up getting a bag because I didn’t think I would use it that much, and I wanted something that could be compacted down for easier storage.
A cool bag will typically have a foil layer, and in between the layers, some kind of flexible foam.
A cool box is obviously ridged, so it is better at protecting the things inside, avoiding squashed sandwiches. They are bigger and heavier, but a good quality box should, in theory, have slightly better insulation than a comparable bag.
Keeping a passive cool box or bag cold
Your cold food and drinks will be insulated and stay naturally cold for a reasonable amount of time, but if you want to keep things cold for an extended period, you will need to add some sort of ice or ice pack.
I bought some flat ice packs for my back, and I normally use these as a layer on the base of the bag, with my beer on top. However, they are not very cheap, so on a long day, I also use a bag of party ice.
Cool boxes and bags should be leak-proof, just make sure you check this before you use a big bag of ice.
With the combination of a reusable ice block and a bag of party ice, I woke up the following day to find that my leftover beer was still cold, and there were still a few bits of ice left in the bag.
- ★ Proper Slim & Interlockable design allow you to make cubes or build freezer wall to fit into different sizes of lunch boxes, bags and kids'coolers. The wide base and blue gel can retain and deliver more coolness to keep your food cool, fresh and tasty longer.
- ★ Reusable and durable, hard plastic with staged-surface treatment to avoid deformation when freezed, more stronger than flat design and no worn out and to be freezed quickly to reuse
- ★ Multi-occassions to use – cooling your food/snack/beverages in lunch bag; medicines storage and a great match with picnic basket, food trays on a camping, road trip, tailgating party, shopping grocery home or a portable air contioner when you are crowded in the London Central line
- ★ 100% SATISFACTION - Buy today and get a 100% money-back within 30 days. If not satisfied with our product, return it back. No questions will be asked.
- ★ NOTE: Handwash only, do not put them in dishwasher or microwave.
The Best Passive Cool Box & Bags for Summer 2022
Lifewit 30L (50-Can) Soft Cooler Bag
- SUPERIOR CONSTRUCTIONS: The exterior of the lunch bag is made of water resistant and water resistant 600D Oxford fabric, it keeps items stored dry and cleaned. The inner lining was made of food grade PEVA sheet and padded with 8mm EPE foam for excellent thermal resistance.
- High capacity: The high-quality PEVA lining provides excellent thermal resistance to keep food fresh and hot/cold. Large enough for the whole family picnic essentials and small enough not to be bulky, it's ideal for camping, hiking, BBQ, etc.
- OUTSIDE POCKETS: Offers a wide opening for easy loading and unloading. There are 2 side pockets to store drinks, bottles and even umbrellas. A deep front pocket to put candy, towels, keys and other small things.
- PORTABILITY: Designed with a padded handle and detachable shoulder strap that offers multiple ways of carrying and allows for hassle-free transport. It can also be folded flat for bulky storage.
- MEASUREMENTS: The maximum capacity of the lunch bag is 30L. The overall dimensions of the lunch bag are 15.7 x 10.4 x 12.2 inches/40 x 26.5 x 31 cm.
This is the bag I bought, so I can personally vouch for it. After spending so long trying to decide what to get, I thought I had best not spend too much money and went with the best-reviewed reasonably priced bag. I was not disappointed.
It comes in three sizes, 20L, 30L, and 40L. The 30L option had enough room for more than enough beer for me and likely enough for a few people.
Thermos Radiance Cooler
- Durable water resistant outer material
- Leak-proof, reflective silver PEVA liner for improved insulation
- 100% PVC free liner
- Unique Thermos IsoTec insulation - superior quality closed cell polyethylene foam Insulation
- Keeps cold for 5 hours
Not as large as the Lifewit, but it is made by Thermos, which are one of the most reputable brands in the business. The Amazon reviews confirm it is a superb bag.
PENGDA 30L Cooler Backpack Rucksack
- LEAKPROOF & INSULATED Our advanced large cooler backpack is designed to provide outstanding performance and keep your items at optimal temperature at all times. It has an airtight zip that ensures excellent insulation by trapping cold air while protecting against external moisture. Enjoy long-lasting freshness for your snacks and drinks with our cooling backpack, no matter what environment.
- FAMILY FAVORITE Our cooler bag backpack offers a generous capacity of 32 litres and allows you to effortlessly store 39 cans of drinks. With the dimensions 33 cm x 19 cm x 45 cm and a weight of only 800 g, it offers enough space for meals, snacks, large drinks, and all your necessities. This leak-proof picnic backpack is easy to clean and provides robust cooling for beach picnics, family holidays, camping, work.
- WELL STRUCTURED & PRACTICAL The design includes a spacious insulated main compartment, two side mesh pockets, two large front zippered pockets for utensils, a zippered pocket in the lid, a mesh inner pocket, and even a convenient bottle opener on the strap. Stay organised at all times with this versatile backpack with cooling compartment and optimally equipped for every trip.
- COMFORTABLE AND DURABLE DESIGN: the PENGDA waterproof backpack attaches great importance to comfort and durability. The padded and fully adjustable shoulder straps provide maximum support and ensure a comfortable fit. Made from high quality nylon, this backpack is designed to withstand even the most demanding use without tears, tears or scratches. Despite its durable construction, it remains lightweight and easy to carry.
- VERSATILE AND RELIABLE With its fashionable design and convenient compartments, this stylish backpack is not only an insulated cooler bag, but also a versatile choice for work, travel or weekend getaway. In addition, it comes with a one-year warranty to give you extra peace of mind. If you have any questions, just contact us by email, and we will reply you within 24 hours.
If you are going for a hike, or just walking a reasonable distance, then a backpack-style cooler may be a more convenient solution. This is a 30L backpack, and they claim it can hold 39 cans.
One reviewer said this worked well at Glastonbury, with the ice keeping for around 7 hours and then beer staying cold for a few more hours after this.
Coleman Xtreme Cooler
- LARGE CAPACITY: With a 48-liter capacity, the cooler box offers enough space to keep bottles, cans, BBQ food, snacks, and more, cool and fresh for days; outlet valve for easy draining of melted ice
- HIGH-PERFORMANCE COOLING: Through high-quality PU full foam insulation, including in the lid, the insulated box keeps drinks and food cold for up to 4 days; perfect for camping, picnics and festivals
- DURABLE MATERIALS: The ice box is made from tough HDPE plastic and impresses with its stylish design; sturdy handles on each side make transporting the box easy
- EXCELLENT FEATURES: Thanks to its robust design, the cooler can also be used as a seat; the lid also features recesses for securing cans and bottles
- Dimensions: inside 47 x 31 x 38 cm, outside 56 x 42 x 47 cm; weight: 5.5 kg; cooling time: up to 4 days; max. seat weight: 113 kg; capacity: 48 L; outer material: HDPE plastic; full foam insulation
The Coleman Xtreme range of coolers appears to be the best-reviewed cool boxes on the market. The performance ranges depending on which model you choose.
At the top end, you have the 70QT, 80Qt and 100QT Xtreme, which claim 5 days worth of ice retention. Even the smaller, more affordable 28QT Xtreme has 3 days worth of ice retention.
Thermos Cool Box
- Lightweight and robust construction
- Handle locks lid in place
- Polystyrene insulation
- External dimensions approx - 43 x 30 x 45 cm (L x W x H). Internal dimensions approx - 33 x 20 x 43 cm (L x W x H) includes lid
- Keeps cold for 8 hours
Again, it’s Thermos, so it should be good. Though it is worth noting a few people have criticised the build quality, so I’d recommend the Coleman options over this.
This comes in two sizes, either 28l or 32l.
I am James, a UK-based tech enthusiast and the Editor and Owner of Mighty Gadget, which I’ve proudly run since 2007. Passionate about all things technology, my expertise spans from computers and networking to mobile, wearables, and smart home devices.
As a fitness fanatic who loves running and cycling, I also have a keen interest in fitness-related technology, and I take every opportunity to cover this niche on my blog. My diverse interests allow me to bring a unique perspective to tech blogging, merging lifestyle, fitness, and the latest tech trends.
In my academic pursuits, I earned a BSc in Information Systems Design from UCLAN, before advancing my learning with a Master’s Degree in Computing.
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