Gawd, of course when I started vaping, the 901 starter kit: 2 batts, 1 atty, 30ml bottle. Pita! The endless batt dance then 5 more batts... Gawd I felt like a girl carrying all this stuff...got the SD...went to 3ml dropper botts and 1 extra batt, the envetable driving and no way to charge a 16340 batt....so I got/made some passthrus... Yikes!!! Got 5vdc and was killing attys...so I got car charger for SD batts. Got/made a 901-801 adapter...that setup stays in car(a van, and no I don't know what color or where I parked he he) except for charger fit dollar store eyeglass case...and second case is alittle smaller for 1 atty, 2 batts, 2 3mls of diff. E-liquid...used some shamwow to line the case with double stick tape for noise and juice droplets on the stuff...and keep binford 9000 e-cig (harbor freight ) tool travel case with stuff in it to open a small store...it's a manly setup...weighs about 16 lbs egg crate foamed for noise and to keep thing from getting beat up.
If I swap SD batts a 1 bottle of juice, the second eyeglass case works for egonado and adapters for 901 & 801 with spare attys...ah what was the OPs question Again? Eyeglass case for going out.... Is mostly what use. He he