Use these plain white envelopes for mailing larger documents or avoiding a distracting fold in important documents. Heavily gummed flaps secure the documents inside. Design also features open-end styling and 24 lb. weight to save on postage.Use these plain white envelopes for mailing larger documents or avoiding a distracting fold in important documents. Heavily gummed flaps secure the documents inside. Design also features open-end styling and 24 lb. weight to save on postage.