This bag has 2 straps; the main strap is slung across my chest and a thinner side strap that goes under my other armpit to keep the bag from moving sideways. To access any of my camera gears, I just need to unbuckle the side strap and slide the bag to my front.

Three adjustable positions on the 2 straps enable the bag to be adjusted to suit different body sizes. It may seem to be a daunting task at first but when carefully adjusted, the bag will hug your back like a tortoise's shell.