The Split Premium recycling cupboard from Keter is an excellent outdoor cupboard for separating waste easily and efficiently. The recycling cabinet is easy to clean and very secure thanks to the lockable doors. Polypropylene back wall: The back wall of this outdoor recycling bin is made of polypropylene sheets. The biggest advantage over a cardboard back wall is that polypropylene is waterproof.Easy to assemble, use and clean: Assembling the outdoor cabinet for recycling is a breeze. For extra stability, it is recommended to fix the cabinet to a wall.