Crystal Clear Bags - with a foldover flap, seal the flap down with a small plain or printed label. Flaps vary in size, but are usually around 25mm deep.
These bags are large enough for the card size shown and a matching envelope to fit inside.
Each size bag is each shown against a Standard A4 (210mm x 297mm) sheet of paper, making it much easier to see at a glance, the approximate size of the bag you are looking at.