10" x 13" booklet envelopes are made of durable, 24 lb. white wove stock for home or office mailing, storing and organizing. Whatever your needs, booklet envelopes are a must for keeping projects, files and mailings manageable. They open on the long side to easily insert and retrieve documents. Sturdy stock can withstand extensive handling and mailing. Contents are protected during use to give you assurance they arrive unharmed. Fully gummed flap ensures a secure, permanent seal. 10" x 13" size is perfect for standard-size documents without folding.