no proper cover and protection, but rather only a thicker front and back sheet

I did not realize that they are not here to correct envelope in the mobile phone is located and is therefore protected side but only a front and back cover pages without the top to protect the bottom and right. The cover is glued on the back with about 2 cm width and thereby holds. How long does this adhesive bond is questionable. I have not tested it, because I'm going to return the envelope because I do not look very impractical and as protection. When I plus see that cost you almost twice as a leather sleeve so I can only advise against buying from a because it is safe here at thin plastic.