There are very few reviews of this 4 SD card holder so I thought my impressions might be useful. I'm an old professional photographer, now I mainly shoot for myself with a compact Fujifilm XT-2 mirrorless camera. When I'm on an important photo trip, I prefer to leave my laptop at home and back up my SD cards in the camera every night by copying the camera's original SD card to the backup SD card. I leave images on both cards in case the card crashes. The only problem with this method is that it's difficult to keep track of all the cards and keep them in order, especially without labeling the cards themselves. Which ones are empty, which ones are full, which ones are original and which ones are backup? Failure to do so can have devastating consequences. Keeping cards in the tiny sleeves they come in is frustrating. This case really helps. I have two, with slots marked "empty", "full" on the outside of the case, and one case just for backups. These pouches are so thin, only 3/16 inch, that they fit in almost any tote bag. The cards hold securely but are easy to remove if you have fingernails. They aren't waterproof, but I didn't need them. (Waterproof cases are much thicker.) Overall, this is a great product.
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