These zip locking bags, ClearZip , are considered and to be used as a general purpose or regular duty 3 mil zipper lock top bags. Our 3 Mil zipper locking bags come in 10 different sizes and are suited for all types of shipping, packaging, and storage applications. Our ClearZip 3 mil plastic zip bags feature the highest-quality zippers to safely secure items the first time protect your items from outside contaminants and make storage and organization simple. Not sure what size you need? Not sure what size you need? Try our 2 Mil Clearzip Assortment Pack.