This tray (1) fits MT3 profile keycaps and (2) is large enough to store a base set with a couple of extra sets. However, the tray feels flimsy and the latches aren't stable. Most trays of better quality as smaller, but I'd rather have two of those than one of these.
Got a pack of Max storage trays, mostly to organize keycap sets that came in bags or had lots of extra keys.
Even though it did its job with the most of my stuff (Cherry / MT3), the Max version doesn't work that great with DSA or low-ish profile keycaps: there is a lot of height to accomodate potential SA / MT3 caps, so the carefully organized and ordered low keycaps went leapfrogging in their rows. Had to use bubble wrap strips to create a buffer to keep them in place (though it makes it worse for a showcase scenario).
The Standard option is lower (= less wiggle room), but it can contain just a base set. So the ideal solution for DSA would be to have a low-profile version of a Max, though it makes it a fairly niche product.
Overall I've enjoyed this one and am waiting on getting a few more for some of my other keys. I do want to note that because it can fit some taller key caps, that does mean there's more vertical space and so if you're moving it around and rustle it a bit, some of the keys can flip/skew and not look as neat in the storage. Would be interested if there's something that can be put on the bottom to make the keycaps stay in place more.
The max size is absolutely giant. It could probably store two keys of keycaps, or, in my case-the entirety of the Black Speech set plus numpad plus black extras. Latches pretty securely too. I’m quite happy.