What's The Difference in The Acid Free Material I Use?

Store your Digests, Paperbacks and Pulps in our POLY BAGS and protect them from dust, dirt, finger oils and other airborne pollutants. Our bags hold size and thickness tolerances and come in printed outer bags for easy product identification. We stock paperback, pulp magazine and digest bags made out of polyethylene and polypropylene. Both of these materials have passed the Photo Activity Test (P.A.T.) certifying that they are safe for long-term storage. • Polyethylene (PE) is a soft, clear material with "breathing" capabilities (lets moisture escape). It has some elasticity which allows a tighter fit than polypropylene or polyester. It has good contact clarity. • Polypropylene (PP) material is crystal-clear with excellent contact clarity. It is bi-oriented material which will not pucker or ripple over time. PP is stiffer than polyethylene. The side seals need care when inserting items, as the seams are not as strong as the PE seams. This is a short break down of the materials most often used for clear collection protection sleeves. Many people prefer mylar which is VERY clear with a "crisp" feel to it, but did you know that frequently removing a product stored in mylar CAN make microscopic tears over time? Mylar would be best used for shorter term storage. For more information and details on collection supply products, please visit