This bag affords you great freedom of movement while keeping your necessities close, and it looks much chicer than a backpack. A good cross-body bag will have a sturdy strap that’s adjustable with a front flap that’s easy to maneuver. It shouldn’t be too heavy and should be a medium size — go too small and it’s not going to be very functional, too big and it can overwhelm you (not to mention, throw off your balance).