None of the several LowePro bags I have has ever failed to start! My main bag is a LowePro MiniTrekker backpack and holds a D800, 12-24, 24-70,70-300, 8mm, 50mm &105mm along with spare cards, batteries, filters, cleaning kit, torch etc. Could be said to hold too much - it takes me well over the hand baggage weight allowance if I leave everything in it for the weigh-in!
I'm also very happy with my RedSnapper canvas shoulder bag (? Duo ?) which holds a few compacts and a bridge with room to spare for spare Solomons and shirt. Has a pocket in the back which keeps my netbook safe too.