Folded Bottom Seam: The most widely utilised design, where the bottom is folded and stitched with one or two parallel threads to deliver trusted toughness for typical 5 kg to fifty kg loads; Improved with UV stabilization for outdoor storage, safeguarding the bag and contents from daylight damage. 100% Reusable https://www.jtfpack.com/products/bopp-pinch-bottom-bags/