I went last night to try to find an 8-gallon Action Packer to put on my KLR. Didn't find any of those, but found this 10-gallon "Tough Tote" with a hinged lid and latch for $18.
Build quality/ruggedness is about the same as an Action Packer; polypropylene or whatever that stuff is.
I got it on this morning. The base wasn't big enough to use the four original rear rack bolts like I'd done with my milk crate, so I had to drill a couple of holes.
The lockable latch falls into the "keeping honest people honest" category but it's kind of nice to have, as is the hinged lid. I even scrounged up a small padlock out in the garage that works with it.
All in all, much better than spending 10 minutes in the parking lot at work trying to get stuff in and out of a backpack and putting stuff in trash bags inside the backpack if it's going to rain, messing with bungees, etc. It holds my duty belt, etc. on the way to work, then my jacket, pants, etc. once I get there. Good place to keep the rain gear, too.
I was hoping my helmet would fit in there too, but it won't.
I'm going to find some bolts with knobs on them to make an efficient "modular cargo system" where I can quickly remove/install either the tote or my old milk crate with no tools depending on what I'm needing to do.
Not the best day to take pictures as it's raining and I was stuck in the garage, but here's what it looks like. It looks pretty large in the photo, but that's just the angle. Compare it to the rear rack for perspective.
Color is non-negotiable: green/black only.
Another plus is that it doesn't obscure the tail light as much as the long, overhanging collapsible milk crate did. Think I'll add some reflectors or reflective tape to it.
I'll post a better photo of it when it stops raining and the sun's out.