Is it worth the trouble and expense to carry emergency oxygen?

[rjack321]

An al40 (boosted) is basically twice the capacity of a medical E and almost the exact same size. A 40 on a DAN demand reg lasts a bit under 2 hours

 

[2airishuman]

@2airishuman that's where the AL80 of O2 is much more useful and why I don't carry medical O2 bottles with me when I'm doing normal diving, despite owning several. You get 55cf of gas *without a booster, 75cf with* and you can always use the rescuean with nitrox which is better than nothing. Have you asked any local an/dp instructors what it would take for just the AN part? It's annoyingly a stupidly IMO a 2-day course, but if that's the only way to get scuba tanks filled with O2, then it is what it is.
Otherwise, are you sure there's no one in your area with a booster?

Emergency O2 in Minnesota

I have a variety of options before I get to that point.