Make sure you protect your handmade cards by using these self seal bags when re-selling your creations! They are perfect for devoted card makers because the bags are acid free so will protect your creations for many years to come. Cellophane bags from Craft UK. Self-seal. Great value pack of 50 bags. Ideal for storing, protecting and selling handmade cards. For 6 x 6" square cards and envelopes - bags measure 158 x 155mm, plus 26mm self seal flap.