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Our First Day Cover Sleeves come in 2 materials, which are listed below. Each material has unique properties. Choose the material that best agrees with your current storage methods.


• Polyethylene is a by-product of natural gas. It is a soft clear material that has some give to it. It has excellent contact clarity.. Our polyethylene is made from 100% pure-virgin material.
• Archival Polyester (Mylar) an inert material of the highest clarity. We use DuPont inert Melinex® or a suitable equivalent. Polyester (Mylar) will not discolor, damage, or adhere to items placed inside it. It is a sturdy film that beautifully displays, timelessly protects, and gives extra support to fragile document s.Used by the Library of Congress.

First Day Cover Sleeves. 4 x 6-3/4".
2.5 mil Polyethylene. Fits U.S cover - # 6 envelope.
Long-term Storage.
Description:
First Day Cover Sleeves
4 x 6-3/4"    2.5 mil Polyethylene.
Fits U.S. cover - # 6 envelope.

Open on one short end.
Long-term Storage.

Base SKU: sfdcus6

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First Day Cover Sleeves. 7-3/8 x 4-1/4".
4.0 mil Polyester (Mylar). Fits U.S cover - # 6 envelope.
Indefinite Storage.
Description:
First Day Cover Sleeves
7-3/8 x 4-1/4"   4mil Polyester (Mylar)
Fits U.S cover - # 6 envelope

Made from crystal-clear, semi-rigid polyester material that has been approved by the Library of Congress for indefinite storage.

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. 4-1/2 x 9-7/8".
2.5 mil Polyethylene. Fits U.S cover - # 10 envelope.
Long-term Storage.
Description:
First Day Cover Sleeves
4-1/2 x 9-7/8"   2.5 mil Polyethylene
Fits U.S. cover - #10 envelope

Open on one short end.

Long-term Storage.

Base SKU: sfdcus10

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First Day Cover Sleeves. 10 x 4-3/4".
4.0 mil Polyester (Mylar). Fits U.S cover - # 10 envelope.
Indefinite Storage.
Description:
First Day Cover Sleeves
10 x 4-3/4".  4 mil Polyester (Mylar)

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 storage. 

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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