I’m rather taken with this clever and environmentally sound product called Envelope Angel. The idea is that instead of throwing away used jiffy bags and padded envelopes, you stick one of these labels on it (there’s one for the address where it’s going and one for the sender’s address) and it gets re-used. And you put an unused label in with whatever you’re sending so the recipient can use it again. Simple but brilliant! And it comes in regular or London Underground varieties. Want!