I have the Rat Wallet and I am not sure what it's for. It's too fat to be a wallet in your pocket and the phone pouch on the outside is too small for a Blackberry/Iphone etc. I suppose on your belt it's OK.
I also have a Trangia 27 - but mine is the Duossal model (stainless steel on the inside, Aluminium on the outside). I find it a very good size for 1 or 2, and awesome with the optional gas burner. I agree with Alan that the non-stick frying pan is useful, but I would just as soon have normal other pots as I think the non-stick coating is a liability.
On my Trangia 25, I have the non-stick frying pan only - other pans are normal alu. I also have the round strainer/chopping board that fits inside the frying pan - mainly to protect the non-stick coating of the frying pan from scratches when the Trangia is packed up.