Stainless steel is great for food storage, because it doesn't discolour or retain smells. And, of course, it's sustainable. The Arthur Lunchbox combines the smartness and practicality of steel with a flexible, easy-to-apply silicone lid. With three convenient compartments for different foods, it can hold a generous 900ml (but don't use it to store liquids, if it's going to be stored non-horizontally).