I used to carry stuff in a case similar to the Witz compact case that I got as a freebie from the navy, but found it awkward putting and taking stuff out, especially if the item is shorter than the height of the case. I rather have a box open lengthwise like an otterbox. I find it more convenient that that way.
I use an Aquapac for my phone or walkie talkie when kayaking and have not experience any problems but would prefer a a crushproof type box