Hey everyone!
Currently, my one and only vehicle is a '12 CBR250R, and as much fun as it is to blast around on two wheels, I had to do something to make it more usable (read: car-like (cringe)).
So in my attempt to do so, I searched for cargo carrying options available for this bike. Being the cheap-skate that I am (not a bad thing, I promise!) I shuddered at the retail price tags of what I found commercially available for this bike. Being a DIY guy whenever possible, I continued on.
I stumbled on CBR250R.net, specifically
Sendler's build thread where he made a rack from a polyetheline cutting board. Intrigued, I continued on to find that the next person made a bigger tray, then finally the last post was a box affixed to the pillion seat.
Inspired, I took some seat measurements. With these in hand (15-16" wide, 15-24" long (without hanging off the end too far) and a guess of 10" tall), I went to the web, searching for something that might work for me.
I finally came across the Plano 56Q Sportsman Tote. Perfect fit. 15x24x13. Bit taller than expected, but whatever. It'll fit more stuff. Additionally, it seems like it'll fill the low pressure spot behind me pretty well.
I picked it up this morning with some mounting hardware (two J-Bolts, nuts, and washers) and a ratchet strap. The J-Bolts hold on to the rear handles as seen below, and the strap is threaded through the metal pillion seat lock thing like TestBacon did.
(Upload failed me here, so I had to link. Apologies in advance for any inconvenience)
http://i.imgur.com/zVxvuh8.jpg - Profile
http://i.imgur.com/qt26K7Z.jpg - Front
http://i.imgur.com/9cFEwyu.jpg - Close up
http://i.imgur.com/LjgwSCd.jpg - Under rear
http://i.imgur.com/CfHgMm3.jpg - Inside