Hello and welcome to the forums!
I've got one of those JC Whitney Large travel trunks on my KLR and it seems to hold quite a lot. I can get 4 to 6 bags of groceries in it depending on the bulkiness of the items. Can't quite close it with a full face helmet though unfortunately. I checked their site, but they only have the medium listed, perhaps they are out of stock on the larges. Not really heavy duty, but easily removable with the mounting plate and cheap .
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