500 x size M1 Tenvolope branded M-envelope boxes, also known as postal m-folders. The size of these boxes when used to maximum capacity and fully opened is 219x155x70mm. The size in cardboard envelope format is 289x226x1mm.
This unique and innovative packaging solution consists of peel and seal postal cartons that are length adjustable, width adjustable and depth adjustable, making them an excellent and flexible solution for ecommerce businesses to send products in the post and via courier. Also known in the market as m-folders, this product type is widely used by Amazon.

The length, width and depth can all be adjusted as explained in the video available on this site. Note that as the width and length increases, the depth decreases. Easy to pack with peel & seal strips, and an easy opening rippa strip for customers to easily open the package. The structure of this packaging creates one of the most robust ways to send items in the post or via courier, avoiding damage to items from occurring, yet presenting a lightweight solution.

The size and specifications of the M1 Tenvolope are as below:

Size Reference: M1
Internal Size (Adjustable As Follows): (219-289)x(155-226)x(70-1)mm
Seal Type: Peel & Seal Strip
Royal mail size: Large letter (when used with a depth less than 25mm)
Weight per carton: 55g
Board grade: 125K/T

The Tenvolope brand and print reflects to your customers that the product is made from 100% recycled material, is indeed 100% recyclable, and represents an environmentally friendly packaging solution as such.