Corrugated Tuck Top mailers are furnished flat, and with their rigid self-locking design, they set up in seconds. Tuck Top mailers are perfect for shipping and mailing smaller, shelf display, or storage. Our tuck top mailers are #3 white on the outside which makes an attractive presentation of your product. Dimensions provided are inside dimensions and tuck top mailers come in a variety of styles. The first dimension is Length, followed by Width and thenDepth.