Blue Summit Supplies Envelopes, Conformer Envelopes, Rigid Expansion Mailers, 25 Pack

Expanding Conformer Envelopes are Perfect for Shipping Thick Documents, Booklets, or Books with Variable ThicknessesConformer envelopes expand uniformly to fit the contents inside to make shipping a thick stack of documents, a thin booklet, or even a book easier than ever before. Measuring in at 9.75” x 12.25” and designed to offer flexibility and versatility for your mailing, Conformer envelopes store perfectly flat for easy and space saving storage. Patented construction offers extra durable strength thanks to strong 14pt paperboard, inset glue seams, and uniquely engineered expanding corners Mailers will expand along the pre-scored lines to fit extra capacity inside up to 5/8" thick but only when you need it, eliminating the need for extra void fill, bubble wrap, or packing peanuts Contents inside your mailers will stay flat, secure, and safe throughout transit inside the heavy duty peel and seal flap, which offers a permanent seal with no need for extra packing tape Our secure Co