A legal-size envelope typically has dimensions of 9.5 by 15 inches. Legal-size envelopes are made to hold, mail, or transport 8.5 by 14-inch legal papers.
Legal envelopes made of paperboard, manila, and other papers are used to mail documents through mail services like the USPS. Legal envelopes are larger than regular envelopes and can hold numerous pages of a document.
In addition, legal-size envelopes are ideal for delivering documents like photos and other items that become damaged when folded. Some legal-size envelopes are made of thin plastic and intended to store and organise legal documents for use at home and at the office.