I have long been waiting for this backpack the Flipside series. The others were too small for me, or otherwise impractical. In this model, Lowepro has done everything right. Super Form Factor for long lenses and their accessories. Slightly built but still comfortable and airy to wear - even on a bike. Above all, I like the access from the back, without having to set the backpack on the ground - which is precisely the terrain usually goes poorly. All in all a super combination of two hobbies: sports and photography. So you miss less picture opportunities.