For everyday personal and business mailings, you can use 4.75\" x 6.5\" Envelopes that are sturdy being manufactured from the 24lb White Stock Paper. Without getting moisture inside, they could be securely sealed with the gum flap closure. Besides, their thickness ensures that the important and confidential documents cannot be seen through. For promotional purposes, you can personalize these envelopes with your company name, logo, address and information on top for reference. The sizes of these envelopes are great for carrying letters, photos, invitation cards, legal papers, payrolls, wallet sized checks, bills, and memos. They are of great value for both personal and commercial uses and will successfully meet your everyday mailing necessities.