Running bag with a convex back panel

A backpack comprising:

• a bag having a convex back panel curving outward from a center of the user's back along a radial axis such that the bag has minimal contact with the user's back when the backpack is worn, wherein the convex back panel further comprises a continuous, single support panel extending through a height of the bag from a top side to a bottom side, the support panel having an elongated upper region that contacts at least a portion of a thoracic spinal region of the user's back when the backpack is worn and a lower region contacting at least a portion of a lumbar spinal region when the backpack is worn, the upper region of the support panel having a uniform width throughout its length and the upper region being narrower than the lower region;
• the support panel comprising grooves extending from the upper region to the lower region and a plurality of contours in the lower region for providing a contact surface for contacting the user's back;
• the support panel further comprising a plurality of connecting air channels extending from the upper region to the lower region, running between the grooves and the plurality of contours in the support panel;
• and
• a pair of adjustable shoulder straps operably connected to the convex back panel to secure the backpack to the back of a user when the backpack is worn.