"Secutiy Envelopes Expandable up to 2"". Opaque for confidentiality. Double glue strips and double perforations at the top let you reseal these envelopes for another use. Made of waterproof, co-extruded polyolefin. Lightweight envelopes are durable and will save on postage costs 100 envelopes per box. X-Ray 20-3/4 x 17-1/4"
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