Our 10x15 envelope is made of heavyweight 28lb kraft paper for exceptional durability and resistance to tearing, puncturing, and ripping Our 10x15 Envelope Clasp features metal clasp and a reinforced eyelet, ensuring reliable closure and easy access for repeated use Gummed flap with a strong adhesive creates a firm, secure seal for mailing and storage purposes 10” x 15” dimensions fit letter and legal-sized documents without the need for folding or resizing, suitable for various mailing needs Ideal for office filing, storing, mailing manuscripts, certificates, art prints, posters, and organizing oversized papers without creasing Blue Summit Supplies 10” x 15” clasp envelopes are a go-to solution for anyone seeking reliable document storage or secure mailing options. Crafted from heavyweight 28lb kraft paper, these envelopes are exceptionally durable, resisting tears, punctures, and rips. Metal clasps and reinforced eyelets ensure secure closure and easy access for repetitive use, making them a practical choice for frequent document handling. The envelopes feature a gummed flap with strong adhesive that provides a firm seal, whether for mailing or storage purposes. Their versatile sizing perfectly accommodates letter and legal-sized documents without requiring folding or resizing, making them a convenient option for various mailing needs. Whether it's for filing, storing manuscripts, certificates, art prints, posters, or organizing oversized papers without creasing, these envelopes prove to be versatile and reliable in fulfilling multiple office and organizational requirements.