This is a case for the Nintendo Switch Joy-Cons I designed, so they don't accidentally get turned on in transit. It can hold two Joy-Cons and their straps. The top part of the case is held on by magnets and will only fit one way. If you try putting it on incorrectly you could scratch your Joy-Cons.
It can be a tight fit with the straps if they still have the cord attached but they should still fit. I had previously removed the cords on one of my pairs of straps and those fit much better.
The magnets I used: