Three-dimensional ventilating pad for backpack

Abstract

The pad is made of a soft and flexible foam material and has an ergonomic design with a upper pad member and a lower pad member, both bulging towards the user's back. Both the upper and lower pad members contain a number of linear channels running straight across the pad members. When the user carries the backpack on the back, the pad members are expanded and compressed as the backpack rises and falls as the user walks or moves. As such, the backpack functions like a pump that continuously drives out humid air from the sweat of the user's back and draws in dry air, both through the linear channels.

1 . A pad attached to the back side of a backpack, comprising:
 an upper pad member bulging outward away from said backpack;   a lower pad member bulging outward away from said backpack and having a larger thickness than that of said upper member;   a plurality of linear channels running across said upper and lower pad members;   wherein said upper and lower pad members are made of a soft and flexible foam material and jointly conform to the curvature of a user's back; and said linear channels are accessible to air external to said upper and lower pads from the circumference of said pad members.   
   
   
       2 . The pad according to  claim 1 , wherein said linear channels are arranged in a mesh.