"travel body" seems to be misleading. Unless you are travelling with only one lens on the body, then the size and weight of the body is important. But if you are travelling with 3 L lenses (a lot of the member in this forum has done more than that), than the size and weight of the body does not matter any more. It will be a big " system". That is the exact reason I bought the EOS M with 22mm and the 18-55 zoom. To make it to be a small travel system.