These Opaque Mailing bags incorporate a permanent self-seal closure and are made from an opaque 60 micron film. Our posting bags self-adhesive strong closure, water and dirt resistant air sealed bags made for Secure the inside and outside. Safe and Secure Package Bags:- These plastic mailers have a sticky strip for easy closure. Once sealed, these bags are very hard to open allowing your items to arrive safely without risk of opening or tampering. Small to Large Mailing bags 6 x 9 Inch / 9 x 12 Inch / 10 x 14 Inch / 12 x 16 Inch / 14 x 19 Inch. Parcel bags for posting Mailing Packaging and more Plastic envelopes for posting:- iSOUL Small to Large postage bags are very light weight and sturdy. You can use its full size or put something smaller inside and wrap the excess before sealing. These Plastic Postage Bags are can be use in any Courier or sealed Airtight storage Purpose, you will get these bags in five different sizes for any size packing material, with the self-seal lip make the parcel air tight and water resistant for personal and business use.