I've travelled with my birdy and DTFS in the soft bag my DTFS came with. I lined it with foamcore (looks like cardboard but with a foam centre) and padded critical points with bubble wrap or clothing(socks etc.) and got pieces of high density packing foam for extra support, lucky we receive a lot of shipments at work I can scavenge from. have had minor problems, cracked latch for the back wheel of the Birdy, broken bell...but otherwise it has been ok, and I can tell that it has been whacked around each time