My O2 flow rate was recently bumped up to a horrible 8 and i'm wondering what i'll do now for O2 when i'm out trying to deal with whatever needs dealing with. The E- tanks was using are pretty much useless to me now. What's left for safe travel when i have to be out and around? Next size up is M60 i think and that looks pretty large to tote around. I'm open as always for your input. I'm learning a lot as i come to the forum for assistance. Thanx.