Two bottless behind the seat that can be fill easily and route two drinking tubes to the front of the bike ala an aero bottle?
you could call it the Double Neverreach
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I think I’ve seen something like it in a mag somewhere. I’ve just never cared for the aero bottle between the bars but I guess I’m going to go with that + aerobottle on the bike.
Do you mean this: http://www.sipaway.shoppingcartsplus.com/catalog/item/1831345/1738370.htm ?
I tried the original version where the bottle were on the downtube and seat tube. As I recall, back then the tubes leading to the drinking point were a bit too narrow which made it hard to get enough fluid. Judging by the photograph of the behind the seat version they have fixed that.
That doesn’t seem to be terribly easy to refill on the fly. And 44 bucks for tubing? I bought a whole roll of the stuff at Home Depot for $15. 
This LINK
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A friend of mine and I used to make these. I still have one. Its 2 (or 1) bottles mounted in a regular bottle holder behind the seat. Tubes are connected to the bottom of each bottle and then run straight along the frame to up between the aerobars. has a bite valve on the end. Mine is adjustable for 1 or 2 bottles. 2 bottles requires a Y connector just after the tibes leave the holder.
Thanks but it looks pretty hard to refill.
Where do you get the double from?
I’ve made a couple of that type of system for folks including myself. Works well as long as you build in a splash proof vent on the rear bottles. Personally I’m back to a front aero bottle as its just cleaner and easier to suck from… Just in case, Camelback sells xtra long hoses which are about perfect for your idea.