Another vote for Thinktank, but it also depends on your budget, they ain't cheap. I got the Airport Accelerator for my trip to South Africa. Another thing to point out is check the weight of the bag enpty, usually info given as part of the spec, what you don't want is a bag that fits the size requirements but weighs 3kg with nothing in it. I had the choice of the 2 versions of the Airport Ultralight, the Antidote and the Accelerator, in the end went for the Acc because it took the 300mm f2.8 attached to my camera body, plus other lenses. Easyjet abit more relaxed over the weight, its just the size of the bag that matters to them. Never flown with Ryanair and probably never will