12 x 16 x 4" White "Side" Self-Seal Expandable Tyvek® Envelopes 50 Per Case

Strong Material – Made from 18 lb. olefin, 10x stronger than paper. Tear & Moisture Resistant – Protects contents from damage. Expandable Design – Expands up to 2" to hold bulky items. Self-Seal Closure – Easy, secure sealing without extra supplies. Bulk Pack – 100 envelopes per case for high-volume use.