Blue Summit Supplies heavyweight 28lb kraft paper envelopes are designed for exceptional durability, resisting tears, punctures, and rips to keep your important documents secure. The easy-to-use paper strip reveals a super sticky adhesive that seals the envelope tightly without the need for moisture. With a capacity to hold up to 60 sheets of standard thickness paper, these sturdy envelopes are perfect for all your office filing and mailing needs. Measuring 13” x 17.7”, they accommodate letter, legal, and other large documents without folding, making them ideal for storing manuscripts, certificates, art prints, posters, and more without creasing.