What Can be used for snail mail flyers homework notes or any other important documents.?

Envelopes are commonly used for mailing letters, documents, flyers, invitations, or other items through postal services or snail mail. They protect and contain the enclosed message or contents during delivery. Envelopes come in various sizes and formats, such as regular envelopes, window envelopes, bubble envelopes, catalog envelopes, and more. They can be made from different materials like paper, plastic, or padded materials, depending on the purpose and level of protection required.