I also can recommend Lowepro Backpack, don´t know exactly what type it is cause I put the Typesheet away it cost about 70€ In that I´ve a 7d with 24-70 2,8 and a Sigma 70-200 2,8 EX DG II; I´m not a good snowboarder and only take it with me once last year but it was very Stormy and Snows all day long, and I don´t wear a skiing glas, with that and the very low wide view and eyes closing because the snow blows in, i crashed very often and the Camera was Still working.