GENERATIONS-Craft Keepers Snap Closure Envelopes. These envelopes are made from durable polypropylene; are acid- free; waterproof; and feature a secure double snap closure. Each envelope has 2.5cm - 1.3cm expansion capacity to hold whatever you need for your craft projects. The envelopes also fit inside the Create a Bag Crop Station. This package contains five 22cm x 28cm Craft Keepers in a variety of colours. Possible colours include: clear; blue; purple; and green. Colour scheme subject to change at manufacturer's discretion. Imported.