Systems and methods for carrying a load on the back of a user and backpacks having a convex back panel are described. The convex back panel of the backpack may curve outward from the center of a wearer's back to minimize contact between the backpack and the wearer's back The backpack may also have a center-support panel for contacting the spinal region of the back of the wearer of the backpack. The center-support panel may have grooves for distributing a load along a wearer's back.