Unfortunately, it is a cheap plastic product, with a few cents cost. The build quality leaves much to be desired, so the edges are for example very unclean and when closed there are gaps between the covers, light can penetrate liquids or small particles through. A waterproof insulation, can not happen anyway. In addition, the folding mechanism and the locking mechanism in a simple plastic, which is bent based. This is naturally brittle and eventually break over time.
One could say, no matter it finally is junk goods which can be replaced quickly. I think the price for this product quality but still quite high, especially because here finally added even the shipping and thus practically doubling the final price.
At the very least protect the Card Safe to some extent from scratches and pressure. One should not just perhaps with full power to tread on (then gives the shell after), but medium pressure, the double layer of plastic is proving robust than tidy.
The design is of course not entirely negligible. Personally, I find it rather ugly, but I do not like yellow as good. So really by design, you can not speak anyway, because that's guaranteed not receive high priority in the development of this product.
There are the Cardsafe also true for xD cards or for a single SD card. I suspect it is it with all these products to OEM supplies, to the Bilora can imprint his name. This should be considered first completely neutral, only should make the company even thought Bilora when the logo also "100 Years of Quality" writes ... a junk product.
Overall, limited to recommend (if no protection for liquids, etc. is needed). The price itself is fine, just along with the shipping costs then quite steep.
Another little tip: If you decide to buy the product, you should know that the product here at Amazon has more entries, with each different offers the dealer! I simply summarized by the different entries for the product:
BILORA - Cardsafe FOR 4 SD / MMC cards
Bilora 165 SD Secure Digital Safe - protective sleeve for 4x SD Card with Key Chain
BILORA Cardsafe - SD / MMC plastic box (