I have recently purchased a Jet Boil to become part of my BOB. I am seeking imput from the group about any type of carrying pouch, PALS or MOLLE compatible, that could be attached to the pack. Does anyone have any expexience with the Maxpedition Mini Roly Poly?? Wondering if the internal diameter of the Roly is exactly 4" or if there's a little extra room. Any imput appreciated.

It will not fit in the mini, and is too tall for the standard as well, it is too tall and the flap won't close.

I have a John Willis pouch that was specifically designed for the JetBoil.

Others that it fits in from what I've read but not tried personally are:
Emdom Fattie
Blackhawk Nalgene Bottle Pouch
LB Tech AITES Nalgene Bottle pouch

Fom experiense I can tell you that the length and the width of rolypoly mega is perfect for JB to lie on the side. But the height is of course too big. But on the other hand you then have room for some more stuff in the same pouch.

It will fit in a Kifaru Nalgene pouch. I think it may be called the Liter Plus pouch. It will also fit in a TAG nalgene pouch.

The JetBoil that I have does not fit in my Kifaru Liter Plus.

Emdom 4x4 SUV fits a JetBoil well, I should know, I designed it, and I have a JetBoil =-) The Supply Captain/LBWolf/AITES Claymore pouch fits both the regular JetBoil PCS and the GCS pot in one pouch, the County Comm EOD bag is the same thing, slightly lesser quality, but cheaper. I've also stored both in an XL Kifaru PullOut. If a pouch is a tight fit on a Nalgene 1L wide mouth it probably won't fit the JetBoil.
-bill