There are a lot of business cards in the bag, which I expected. The bottom line is that the valve only closes when you fill it to 15%! There is a plastic window which also doesn't allow it to close completely unless the plastic and card are crumpled inside! Even if you can fold it, the valve doesn't stay closed and sticks out. Proper measurement and a magnet or buckle would be logical. I was going to return it, but instead I cut out the plastic and folded the flap around it with a rubber band to "train" the flap to close. If you are not willing to do that, I do not recommend buying this product. If you choose to do this, be careful not to cut your finger when cutting the plastic.
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