Pressure -reducing backpack

The utility model discloses a pressure -reducing backpack, including knapsack body, pressure decreasing plate, pressure relief assembly and two baldrics, pressure decreasing plate sets up the one sidethat is close to the back at the rear portion of knapsack body, pressure relief assembly includes spring mechanism and hollow casing, and the casing is installed in the rear portion of knapsack body,and spring mechanism detachably sets up in the casing, spring mechanism includes compression spring and telescopic link, compression spring suit and spacing on the telescopic link, the second of telescopic link end is equal spacing in the casing with compression spring, and the first end position of telescopic link in the casing outside and relatively first the serving down of casing stretches out and draws back, the first end of telescopic link can be dismantled with pressure decreasing plate's lower extreme and be connected, and pressure decreasing plate's upper end is connected with the upper end of baldric, and th