White, 11 x 13.5 inch chipboard mailer with peel and seal flap. These are provided at cost as a courtesy for customers ordering multiple calendars who need mailers to send calendars out individually. If you are ordering a single calendar it will come in one of these…no need to add it to your order unless you want a spare. Fits one calendar. This item does not qualify for quantity discounts, nor does it count toward the quantities required for discounts.