A film processing envelope is formed from a single preglued web and comprises a generally rectangular back panel and a generally rectangular front panel overlying the back panel and adhesively secured to the back panel along opposite edges, and by a fold line along bottom of the envelope. A closure flap is secured to the back panel along the top thereof by a fold line, and means are provided for securing the free edge of the closure flap, opposite the fold line, to the front panel when the closure flap is folded over the mouth of the envelope to overly a part of the front panel. The closure flap may be provided with an element which is either detachable before or after securement of the closure flap to the front panel. The envelope may be provided with a relatively shallow open topped pouch having a back detachably secured along the free edge of the front panel and the front connected to the bottom edge of the back along a fold line, with the front and back being adhesively connected along opposite sides. When provided with such additional pouch the closure flap, when folded over the envelope front panel, will extend beyond the pouch for securement to the front panel, so that the closure flap completely covers the pouch and serves to close the pouch as well as the envelope.