A reusable sleeve pocket, suitable in size for small quantities of nylon. The concern is that for waterproof nylon, it is coated with a plastic layer on the inside. This layer is part of the very first wash: white crumbs full pastry bag (more rubbed to remove them, the more you created), and pocket which is no longer waterproof suddenly ... Manufacturing fault or not, I have referred this pocket after one use (against payment, I have not tested so other pocket).