Suitable for high-frequency welding of outdoor camping waterproof bags, hiking dry bags, marine waterproof duffels, adventure gear storage bags, and any PVC-containing soft plastic materials used in waterproof bag manufacturing. High-frequency welding creates airtight, leakproof seams that effectively block water, dust, and moisture, ensuring the safety of internal items in harsh outdoor environments such as camping, hiking, rafting, and field operations.