Lifetime 60089 439 Litre (116-Gallon) Storage Box for Indoor or Outdoor Use Rigid Dual-Wall HDPE - Dark Brown £80.73 @ Amazon

Lifetime Website Product Link here - it notes it is weatherproof.

Cream here same price OOS but can be ordered if you can be asked

Price matching Wayfair. I ordered the larger box posted last week (Wayfair deal) but it looks increasingly likely this will not be delivered. This is slightly smaller and dearer, but having read up on the brand I'm sold. I ordered yesterday on Amazon (non-Prime) and it's being delivered (fingers crossed) today. I think it is waterproof despite Amazon's assertion. 10 year limited warranty so do register if you buy.

About this item

• Lifetime storage box features an interior capacity of 116 gallons (439 Litres) and has a dark brown wood slat designed sides and lid
• Storage boxes are made to protect the things you value. This includes features such as a water-resistant enclosure that helps keep your things protected from rain, snow, and the elements. Storage boxes are not waterproof.
• It has a lockable lid and molded handles - it moves easily to desired locations
• Its controlled springe-hinge opens greater than 90, won't slam shut, and is lockable
• Storage boxes are made to protect the things you value. This includes features such as a water-resistant enclosure that helps keep your things protected from rain, snow, and the elements. Storage boxes are not waterproof.

Product Dimensions ‎127.99 x 67.06 x 64.01 cm; 20.14 Kilograms
Part number ‎60089
Item display height ‎67.2 centimetres
Item display length ‎127.9 centimetres
Item display width ‎64 centimetres
Item display weight ‎19.5 Kilograms
Material type ‎Plastic
Capacity ‎440 litres
Manufacturer ‎Lifetime Item model number ‎60089
ASIN ‎B00B801ZG4