Woven Polypropylene Bags Large, breathable bags for bulk quantities & long-term storage polypropylene bags With the recent backlash against traditional plastic grocery bags, it's likely you have seen a new material used by retailers and shoppers alike: woven polypropylene. This specialized material is becoming a popular choice to create reusable shopping bags (e.g. the iconic blue IKEA bag) but has been utilized by brands for much longer as an effective material for long-term storage of large quantities of items. woven polypropylene bags for sunflower seeds Polypropylene (PP) is a thermoplastic resin material is produced by the polymerization of propylene. Woven polypropylene is created when strips or threads of PP are woven together in two directions (warp and weft). The result is a lightweight but strong and durable material suited to hold and store bulk quantities of product for extended periods of time. Woven polypropylene bags are nontoxic and non-staining, and they are breathable while still having the ability to safeguard products from damage from water or vapor (with the addition of a laminated film barrier layer). Polypropylene bags are naturally resistant to cracks, stress and tearing due to their strong woven structure, and they will not degrade when coming into contact with moisture. These bags can be produced with opaque or transparent layers and custom printed to display a brand’s unique logos, labels, graphics and designs.