Regular-weight Expansion Envelopes offer superior protection for mailing bulky items that are not too heavy. They are ideal replacements for costly boxes or cartons. Design features open-side style and convenient Flap-Stik closure. Much stronger and more secure than traditional paper envelopes these 14 lb. expansion envelopes made of DuPont Tyvek won t rip tear or puncture. They are water-resistant and moisture-resistant. They are easy to use. Simply peel and seal. Quality Park Self-Seal Light Weight Expansion Envelopes White 100 / Carton (Quantity)