I am in the need of a seat post mount and found a Topeak on amazon.

Just wondering if anyone has any reviews about this before I buy it.

I mainly want something big enough to carry a kindle (5X8), some granola bars, cell phone etc.

Will a kindle fit in there? One of the pics on the link shows it open & it looks like some powerbars take up almost half of the bag width-wise.

hahaha funny.

It also looks like there is an unwrapped wafer cookie or something in there...what kind of redneck puts unwrapped food in a bag? lol

Probably a bit more than the Topeak in the OP (didn't follow the link to Amazon), but this from Banjo Brothers should fit everything inside- and keep it dry.

I have a Delta MegaRack seatpost-mount that works really well. That may be a better option, so that you can use what ever bag you want.