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These Polyester (mylar) L-Sleeves are made from crystal-clear, 4 mil archival polyester, approved by the Library of Congress for long-term storage. We use Dupont inert Melinex or a suitable equivalent. Our polyester has passed the Photo Activity Test (P.A.T.) which means that it is safe for long-term storage.

The unique construction of L-Sleeves (two adjacent sealed sides) allows for quick and safe insertion and removal of photos and prints when not in permanent storage.

Scroll down for sizes and pricing.

We also make a line of Polyester Poster L-Sleeves that fit perfectly in our new archival Movie Poster Boxes. The unique construction of L-Sleeves (two adjacent sealed sides) allows for quick and safe insertion and removal of photos and prints.

Polyester L-Sleeves for 4 x 5" prints
Polyester L-Sleeves for <font color=810541> 4 x 5" />
Description:
4-1/4 x 5-1/4" (OD)
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
**OVERSTOCK 25% OFF**
4 mil. Two adjacent sealed sides. 
Base SKU: slv45

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Polyester L-Sleeves for 4 x 6" prints
Polyester L-Sleeves for <font color=810541> 4 x 6" />
Description:
4-1/4 x 6-1/8" (OD).
These L-Seal Sleeves are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints/postcards when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv46

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Polyester L-Sleeves for 5 x 7" prints
Polyester L-Sleeves for <font color=810541> 5 x 7" />
Description:
5-1/4 x 7-1/4 (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv57

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Polyester L-Sleeves for 8 x 10" prints
Polyester L-Sleeves for <font color=810541>8 x 10" />
Description:
8-1/4 x 10-1/4" (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv810

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Polyester L-Sleeves for 8 x 12" prints
Polyester L-Sleeves for <font color=810541>8 x 12" />
Description:
8-1/4 x 12-1/4" (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.

Base SKU: slv812

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Polyester L-Sleeves for 8-1/2 x 11" prints
Polyester L-Sleeves for <font color=810541>8-1/2 x 11" />
Description:
8-3/4 x 11-1/4" (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv8511

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Polyester L-Sleeves for 8-1/2 x 11-7/8"
Polyester L-Sleeves for <font color=810541>8-1/2 x 11-7/8" />
Description:
A4 Digital Prints
8-1/2 x 11-7/8" (OD)
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slva4

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Polyester L-Sleeves for 9 x 12" prints
Polyester L-Sleeves for <font color=810541>9 x 12" />
Description:

9-1/4 x 12-1/4" (OD). 

These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv912

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Polyester L-Sleeves for 11 x 14" prints
Polyester L-Sleeves for <font color=810541>11 x 14" />
Description:
11-1/4 x 14-1/4 (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv1114

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Polyester L-Sleeves for 11 x 17" prints
Polyester L-Sleeves for <font color=810541>11 x 17" />
Description:
11-1/4 x 17-1/4" (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv1117

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Polyester L-Sleeves for 12 x 18" prints
Polyester L-Sleeves for <font color=810541>12 x 18" />
Description:
12-1/4 x 18-1/4" (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv1218

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Polyester L-Sleeves for 13 x 19" prints
Polyester L-Sleeves for <font color=810541>13 x 19" />
Description:
13-1/4 x 19-1/4" (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv1319

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Polyester L-Sleeves for 14 x 18" prints
Polyester L-Sleeves for <font color=810541>14 x 18" />
Description:
14-1/4 x 18-1/4" (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv1418

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Polyester L-Sleeves for 16 x 20" prints
Polyester L-Sleeves for <font color=810541>16 x 20" />
Description:
16-1/4 x 20-1/4 (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv1620

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Polyester L-Sleeves for 18 x 24 prints
Polyester L-Sleeves for <font color=810541>18 x 24 prints</font>
Description:
18-1/4 x 24-1/4 (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv1824

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Polyester L-Sleeves for 20 x 24" prints
Polyester L-Sleeves for <font color=810541>20 x 24" />
Description:
20-1/4 x 24-1/4 (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv2024

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Polyester L-Sleeves for 24 x 30" prints
Polyester L-Sleeves for <font color=810541>24 x 30" />
Description:
24-1/2 x 30-1/2 (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv2430

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Polyester L-Sleeves for Rock & Personality Poster
Polyester L-Sleeves for <font color=810541> Rock & Personality Poster </font>
Description:
Rock & Personality Poster L Sleeve
20-1/2 x 28-1/2" x 4mil Polyester (mylar)
NO flap
20-1/2 x 28-1/2" x 4mil Polyester (mylar)
NO flap
Base SKU: slvrpp

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Polyester L-Sleeves for 24 x 36" prints
Polyester L-Sleeves for <font color=810541>24 x 36" />
Description:
24-1/2 x 36-1/2 (OD).
These L-Seal Envelopes are made from crystal-clear archival Polyester, approved by the Library of Congress. Their rigidity (4 mil) and unique construction (two adjacent sealed sides) allows for quick/safe insertion and removal of photos/prints when not in permanent storage.
4 mil. Two adjacent sealed sides.
Base SKU: slv2436

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Polyester L-SLEEVES for Window Card Posters
Polyester L-SLEEVES for <font color=810541> Window Card Posters</font><a id=" />
Description:
Window Card Poster L-Sleeve
14-1/2 x 22-1/2" x 4 mil Polyester (mylar)
NO flap
14-1/2 x 22-1/2" x 4 mil Polyester (mylar)
NO flap
Base SKU: slvwcp

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