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Our First Day Cover Sleeves come in 3 materials, which are listed below. Each material has unique properties. Choose the material that best agrees with your current storage methods.

Our Acid-free Backings are .028" thick and white on both sides. Using a backing inside the poly sleeve protects the corners and edges of your collectible first day covers.

     Sleeves, Polyethylene

     Sleeves, Polyvinyl

     Sleeves, Polyester

     Backings

First Day Cover Sleeves - 2.5 mil Polyethylene
First Day Cover Sleeves - 2.5 mil Polyethylene
Description: 4 x 6-3/4". Fits U.S cover - # 6 envelope.
Base SKU: sfdcus6

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First Day Cover Sleeves - 4.0 mil Polyester
First Day Cover Sleeves - 4.0 mil Polyester
Description: 7-3/8 x 4-1/4".  Fits U.S cover - # 6 envelope.
Made from 4 mil crystal-clear archival polyester that has been approved by the Library of Congress for indefinite-term storage. Polyester is used worldwide in libraries and museums for the storage of paper products.

We use our unique Tuck-Lock™ design for these sleeves - closed beaded flap on one long dimension and open-ended on the two short dimensions. This design "locks" the cover in place, but allows easy insertion and removal when needed.
Base SKU: sfdcus6pet

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First Day Cover Sleeves - 4.0 mil Polyester
First Day Cover Sleeves - 4.0 mil Polyester
Description: 10 x 4-3/4". Fits U.S cover - # 10 envelope.
Made from 4 mil crystal-clear archival polyester that has been approved by the Library of Congress for indefinite-term storage. Polyester is used worldwide in libraries and museums for the storage of paper products.

We use our unique Tuck-Lock™ design for these sleeves - closed beaded flap on one long dimension and open-ended on the two short dimensions. This design "locks" the cover in place, but allows easy insertion and removal when needed.
Base SKU: sfdcus10pet

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First Day Cover Sleeves - Poly Vinyl
First Day Cover Sleeves - 8 gauge Polyvinyl
Description: Use for U.S. Cover, #6 envelope.
Ultra-light weight 4 mil.
Made from semi-rigid, crystal clear vinyl. They are open on one long dimension and have a lip for easy insertion. This material is free of chemical softeners and is shrink-proof. 

Inside dimension: 7-1/6 x 4-1/4"
Outside dimension: 7-1/4 x 4-5/16"
Base SKU: sfdcus6v

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First Day Cover Sleeves - Poly Vinyl
First Day Cover Sleeves - 8 gauge Polyvinyl
Description: Use for U.S. Cover, #10 envelope.
Lightweight 5 mil
Made from semi-rigid, crystal clear vinyl. They are open on one long dimension and have a lip for easy insertion. This material is free of chemical softeners and is shrink-proof. 

Inside dimension: 10-1/8 x 4-1/2"
Outside dimension: 10-3/16 x 4-3/4"
Base SKU: sfdcus10v

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