I would recommend kite bag by Vector had one for many years + picked one up on eBay very cheap not long ago, but do appreciate not everybody's cup of tea. Kiteworld ltd of Clacton on sea have good selection of kite bags well worth a look.
I was just looking at some reviews on that with some people saying it was short for some of the larger wings. Im wanting it for an investment that I can keep future kites in as my collection grows. I think it will happily take a Benson DS which is my first serious kite, but it looks like it could be limiting if I wanted to have some bigger kites in the future. Looks like a good bag though otherwise.
There is the one I designed, others speak highly of it. It's probably too late, I've only got one left and I'm keeping that for when my first one finally falls apart. Available through Peter Taylor on the Airdynamics website if he has any left .