We’ve probably all now got dozens of re-usable 'bags for life'. The challenge is remembering to take them when shopping, particularly when it comes to unexpected purchases. Try assigning a pocket in your handbag or jacket to keep a couple of folded cotton bags in, and remember to replace them after use. Replace plastic bags in the kitchen with glass containers or BPA-free plastic boxes (yes, they’re still plastic, but they’re better than single-use bags). Most supermarkets now provide loose fruit and veg, and you can get reusable bags to put your onions and apples in.