Saw this today:
Amazon.com: Rubbermaid 1791983 Bento Storage Box with Flex Dividers Small Paprika: Home Kitchen
It comes in a few colors and a few sizes. I think the small and medium ones might be good fits. Actually, I was thinking the medium for the opportunity area and a small one for the rear seat area just below the vents. One interesting thing about these is they they have 'fold out' sleeves on the inside that look like they could serve as cup holders in a pinch. Anchored with Velcro, they might be decent for interior storage. I saw they are actually available at Target online for less.
I don't have an MS yet, so I don't know the exact measurements. But based on what I see others putting in there, it looks like these may be an even better fit. The red one would be good for Perf/sig owners with the red piping. I'm inclined to go with beige since I got the tan interior. Not sure if they have plain black...they also sell lids so it can be covered...
Not to toot my own horn, but these work great. I got them at Target. I got the small and medium ones. Unfortunately, I don't think there are covers for these. (At least neither Target nor Amazon have them for sale - will need to check the Rubbermaid site, perhaps they will at least show they are available or not).
The medium is a nice fit in the opportunity area. It fits all the way up front. It stays in place without any mod (the feet and the area carpeting keeps them mostly planted).
The small one can then fit in either the opportunity area further back (i.e. behind the placement of the medium one) or it can also fit nicely in the rear area under the rear vents. And it CAN serve as a beverage holder. The fold out spaces will hold a standard 20 oz bottle or non-large takeout cup. If you use it as a rear area beverage holder, you might need to anchor it with velcro strips so it doesnt tip over (I havent tested that). But because it fits nicely below the vents, it doesnt eat into leg room noticeably.
Anyways, I use the front/medium one to hold sunglasses, ID cards (Blink/RFID for entry doors/etc.), a small tub of mints/gum, and my J1772 adapter (all the way up front fold out space) since I depend on the J1772 so much and want it handy.
Finally, they don't look half bad IMO. They don't look too cheesyI did have to get the ones with patterns as my local Target didnt have the plain ones in those size. I wanted to ry them out first. And now that I know they work, I might take them back to exchange for the plain tan ones when they (or another local Target) have them available.
I'll get pics later/tomorrow. But for $20, really you can't beat it in my opinion!
Update: Here's the link to the Rubbermaid site:
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They do have lids for the medium one (which is the one I put in the opportunity area). And now they also have dark grey ones. So, looks like you can reasonably match colors for several trims in the MS.