Obviously it is time to buy a bicymacle (it's actually well past that time, but here we are); and here in Minnemasota, the Upper Midwest's venerable old Mills Fleet Farm can sell you a decent, ecomanomical 26" mens bike for the sale price of $99.
The thing is, I require a bike that can accommodate a rack behind the seat, and it must be the kind to which you can safely and sturdily attach a milk crate (in which you then deposit two carefully balanced grocery bags, see). As far as I know, these racks have two points of attachment, one to the seatpost. And this on-sale one I'm looking at has that silly-looking thing that you see so much on modern bikes; the floating seat-post:
My gut tells me that since there still is something of a seatpost there, sure; why wouldn't you be able to go ahead and attach a milk-crate-supporting rack to the blamed thing. But I am not a experienced cyclist and what the heck do I know about load limits on floating bike posts.
What do you think? Is it doable?