Blake have put a lot of thought and detail into creating an envelope to perform in all environments. Its ability to work with laser, digital and Inkjet technologies and not forgetting the art of writing, these are all areas where this product excels. All this coupled with its brilliant white appearance, 5 year shelf life and quality weight makes this the perfect all-rounder. We guarantee you won't find more in an envelope. These envelopes have a handy peel and seal closure for quick and easy fastening. They are pocket opening - meaning they seal on their shorter side.