I used a Duratool case for a top box; it's a Chinese knock off of a Pelican case (but in its own right, a pretty darn good case). I made my own quick release system for it. I don't know if you're handy with tools, but it was relatively easy to do. Here's a link to my photos of the system, if it helps:
I purchased the 25L Pelican top case kit from Caribou Cases and am VERY pleased. The kit is a little spendy, but it includes a new rear rack, all mounting hardware and a quick release kit for the case. I mounted the system on my 2012 Adventure model and it's working perfectly with the OEM side cases. I'm so pleased with the quality of the top case I'm thinking seriously of selling the OEM side cases and purchasing the 35L Pelican side case kit from Caribou as well.
The local home depot sells a latching hard sided plastic tool box.
I think they called it a technicians tool box. It's black with a grey molded insert that has dividing panels.
Anyway, bag sells for around $35.
I'd get one and bolt it right to the rear rack,grab handle.
I also had good luck mounting my Pelican 1550 case with a Caribou kit from their website. The quick detach hardware works good and I like the usefulness of the mounting rack when used without the case. I had to improvise a bit on the hardware by using a mix of the OEM stuff, the Caribou-supplied pieces, and a couple of bits from the hardware store to get the rack mounting spacing right. Not a big setback, imho. I also drilled new holes in the luggage rack plate to allow it to be moved back another 1.5". This made it more comfy to use as a backrest for my wife when 2-up. She won't go anywhere on the Strom without the case attached now.
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