.Picked up another one of these this morning at a swap meet. I'm unsure who originally made these cassette storage cases, but they're great for stray yet valuable tapes and I always keep an eye for them. They open by pushing in two wire-taught "buttons" on the spine that assuringly snap secure upon closure. Might take a minute to get open before getting the method down.
The cassette rests on two plastic reels and barely rattles when locked in. Also the top lid of the tape, the most delicate part, faces into the case for the best protection as opposed to many cases that force the "lid end" to sit along the opening. I wouldn't recommend it, but you could probably drop one of these cases out of moving car with the tape inside surviving intact afterward.
This morning's case housed an abused copy of Goodfellas which was chucked after purchase. These cases are worth a buck alone regardless of what they contain. Included in the pic is a "normal" and flimsier transparent case for comparison. Also I hope you like the new layout of BoGD.