Is there a limit to the thickness of...
Is there a limit to the thickness of sleeping pad, will Therm-a-Rest NeoAir Xtherm 2.5? thick 20? wide pad fit into the sleeve?
Yes, any 20x72 pad will fit the regular length bag. Big Agnes make the Q-Core pad which is 3.5in thick. It it designed to fit BA bags. The rest of the Big Agnes Air Core pad family are 2.5in thick. You will have no problem with your Therm-a-Rest fitting.