25° single-shoulder bag / 25° single-shoulder bag

Generally speaking，Single shoulder bag straps was flat,
when your backpack Single shoulder bag ,the straps will  glide
down due to the Shoulder slopeThis product Called single
shoulder bag of 25 degrees, it meanings added a 25 degrees of
cushion in the middle of shoulder belt and shoulder. so, when
you back single shoulder bag, it won't slopes and glide ,
we don't have to repeatedly touch shoulder straps.