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Regular-weight Expansion Envelopes offer superior protection for mailing bulky items which are not too heavy. Ideal replacement for costly box or carton. Offers open-end style and convenient Flap-Stik closure. Envelopes made of DuPont Tyvek won’t rip, tear or puncture. Much stronger and more secure than traditional paper envelopes. Regular-weight Expansion Envelopes are water-resistant and moisture-resistant. Easy to use. Simply peel and seal.