Aithre has new 152L carbon fiber bottles available. These come in at 3lbs and 4"x14" for 6.5 hours of constant or intermittent oxygen flow. A Mountain High Oxygen Systems upgrade is available to permit use with MH O2D2 systems to extend the time x 1.5 for more then 10 hours at 10k MSL for one person.
Refill on your own using the MH custom transfilling hose with another portable oxygen tank or using a larger gas company cylinder.
