What I was looking for, being a cheapskate, was a way to carry about 1/2g of fuel on the tail for enduros and DS rides. I don't need the extra gallon from the 70 degree sub all the time and its a big expense for 4-5 rides a year. I mostly HS with my kids right now. I figured I could ride 20 miles or so and at a check/reset dump in a qt. Repeat taking the stress/weight off the tail ASAP.
I can get 2 qt bottles in a $40 tailbag but the fender doesn't seem as stiff as I need. A little support would really go a long way back there. Maybe I can build an extension off the mini aluminum rail on top? I've thought about chopping up the underside of the left number plate too and stashing a bottle in there. I'll be giving it an eyeballing soon.