Buying Sofnolime in smaller quantities?

[Ruffy]

But, from what I have seen, they are far more bulky measured in diving hours.
Anyway filling is hardly a chore, cleaning the thing properly is far more onerous.

Less bulky if anything.!..........however, I choose to fill my own due to cost most of the time..

but there is no denying the fact that the cartridges are bloody handy..can swop one over in about a minute