PP woven bags are naturally resistant to water absorption, but basic woven fabric is not fully waterproof. Gaps between polypropylene tapes, seams, valves, and punctures can admit moisture unless lamination, liners, and protected closures are incorporated into the design.

PP woven bags resist water better than ordinary uncoated paper bags, but the woven fabric itself is not completely waterproof. Reliable moisture protection depends on fabric density, lamination, liners, seam construction, valve design, and how the bags are stored and transported.