First Day Cover Sleeves & Backings

Our First Day Cover Sleeves come in 2 materials:
• Polyethylene for Long-term Storage

• Polyester (Mylar) for Indefinite Storage
For Poly material specifications click here.

The Backings for these sleeves also come in 2 materials:

• .028" thick Acid-free Board for Long-term Storage
• .040" thick Acid-free, Lignin-free, Buffered Board for Indefinite Storage
For Backing material specifications click here.

We have added a new style of Polyester sleeves called 'Folder' Sleeves which are sealed on one long side only. The inherent static in polyester material, keeps the stored image securely in place.

First Day Cover Sleeves.
4 x 6-3/4".
2.5 mil Polyethylene.
Fits U.S. cover # 6 envelope.
Long-term Storage.
**SALE 20% OFF**
Base SKU:sfdcus6

First Day Cover Sleeves.
3-15/16 x 6-7/8".
2 mil Polypropylene.
Fits U.S. cover # 6 envelope.
Long-term Storage.
Base SKU:sppfdcus6

Backings for First Day Covers.
U.S. Cover #6.
3-3/4 x 6-5/8".
.028" thick Acid-Free Board.
Long-term Storage.
Base SKU:kaf28us6

Backings for First Day Covers.
U.S. Cover #6.
3-3/4 x 6-5/8".
.040" thick Acid-Free Board.
Indefinite Storage.
Base SKU:kaf40us6

First Day Cover
US #6 Envelope 'Folder' Sleeve.
3-7/8 x 6-7/8". 4 mil Polyester.
Sealed on 1 long edge.
Indefinite Storage.
Base SKU:sfdcus6petf

Backings for First Day Covers.
U.S. Cover #6.
3-5/8 x 6-3/4".
.028" thick Acid-Free Board.
Long-term Storage.
(Sleeve :SFDCUS6PETF)
Base SKU:kaf28us6pet

Backings for First Day Covers.
U.S. Cover #6.
3-5/8 x 6-3/4".
.040" thick Acid-Free Board.
Indefinite Storage.
(Sleeve :SFDCUS6PETF)
Base SKU:kaf40us6pet

First Day Cover Sleeves.
4-1/2 x 9-7/8". 2.5 mil Polyethylene.
Fits U.S. Cover - #10 envelope.
Base SKU:sfdcus10

First Day Cover Sleeves
4-1/4 x 9-5/8". 2.0 mil Polypropylene.
Fits U.S. Cover #10 envelope.
Long-term Storage.
Base SKU:sppfdcus10

First Day Cover
US #10 Envelope 'Folder' Sleeve.
4-1/2 x 9-7/8". 4 mil Polyester.
Sealed on one long edge.
Indefinite Storage.
Base SKU:sfdcus10petf

Backings for First Day Covers.
U.S. Cover #10 Envelope.
4-1/4 x 9-3/4".
.028" thick Acid Free Board.
Long-term Storage.
Base SKU:kaf28us10

Backings for First Day Covers.
U.S. Cover #10 Envelope.
4-1/4 x 9-3/4".
.040" thick Acid Free Board.
Indefinite Storage.
Base SKU:kaf40us10

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