Best Outdoor Storage Boxes — 375L (2026)
1 outdoor storage boxes matching capacity “375L”, hand-picked from UK Amazon listings.
Not sure which one to pick? Read our Best Outdoor Storage Box UK guide.
These robust 375L outdoor storage boxes are designed to withstand the rigours of British weather and provide substantial space for your garden equipment, tools, or seasonal decorations. Constructed from heavy-duty polyethylene, they’re built to last and resist cracking or fading even when exposed to prolonged sunlight or damp conditions. Ideal for securing lawnmowers, wheelbarrows, gardening sheds, and other bulky items during the winter months or when not in use.
Each box features a secure locking lid with a robust latch mechanism ensuring your belongings remain safe and protected from theft or accidental damage. The durable construction also makes them easy to clean – simply wipe down with soap and water. These boxes are perfect for securing items on patios, decking, or in sheds.
The generous 375L capacity offers ample storage space, while the rectangular shape maximizes internal volume. They’re stackable too, allowing you to efficiently utilise vertical space where storage is at a premium. Remember to check Amazon UK for current stock and availability.
#1 Pick
Amazon Basics Garden Storage Box with Lockable Lid, Outdoor Deck Box for Patio Cushions and Gardening Tools, Weather-Resistant, 375 Litre, Brown- Resin
- 375L
£99.00
Pros
- Lockable lid keeps cushions and tools secure and dry
- Double-wall resin construction resists fading and cracking
- 375L capacity swallows patio cushions or a full set of garden tools
Cons
- Bulky flat-packed box takes a while to assemble
FAQ
What are these boxes made of?+
They're constructed from high-density polyethylene (HDPE), which provides excellent weather resistance and durability against UV rays, frost, and rain.
Can I store chemicals or corrosive substances in these boxes?+
While the HDPE is reasonably resistant, we advise against prolonged storage of strong acids or solvents. Consult the manufacturer's specifications for specific chemical compatibility.
Are these boxes stackable?+
Yes, they are designed to be stacked securely, provided that they're placed on a level surface and not overloaded.
What is the approximate weight of one box?+
The standard 375L outdoor storage box weighs approximately 28kg – 32kg. Check Amazon UK for precise details based on the specific model.
How do I clean the boxes?+
Simply wipe down with soap and water. Avoid using abrasive cleaners that could scratch the surface.
Are these boxes suitable for long-term outdoor storage?+
Yes, provided they're protected from extreme weather conditions like prolonged direct sun or heavy snow. Regular cleaning will help maintain their condition.
What size are the lids?+
The lids are approximately 103cm wide and 68cm deep, providing ample space for larger items. Dimensions can vary slightly by model.
Do these boxes come with a warranty?+
Warranty terms are provided by the manufacturer and are available on Amazon UK’s product page.
What is the maximum weight capacity per box?+
The recommended maximum weight load for each box is 50kg. Do not exceed this limit to ensure structural integrity.
Are these boxes suitable for use on decking?+
Yes, they are designed for outdoor use and can be placed on decking surfaces. However, consider using protective pads under the base to prevent potential scratches or damage.