Welded seams can be a step up from taped seams and might be normally be found in high conclude waterproof backpacks. Instead of stitching the seam and taping them to make a seal, The material is as a substitute fused alongside one another with heat to create a watertight bond. https://canvas-and-leather-backpa27038.slypage.com/29273745/rumored-buzz-on-laptop-bags-waterproof