Hello Steph i just got my penstyle RN4072 yesterday, love it so far cept i dont like the carts, i just now used brown coffe filter method and im pleased with it it taste and feels clean, allot more clean but maybe i just ahve bad carts, it taste sumtimes like they are burning and im pretty sure they are cuz the cart material does melt.
in the white caps that come on the carts inside is a rubber cap u can pull it out wit a paperclip and then put the ruber cap bak on then put the white cap over it also if u pull them from the black mouth piece it will save room they will leak but not all that much whoever up there said paper towel with them has a good idea, im thinkin a blunt/cigar tube would b perfect for these u can get them for about a dollar and there r fat ones and skinny ones the skinny one will prolly b better and are called cigarillos, if u have the patients u can cut them shorter so they arent so long. hope this all helps. oh yea ive found that the skullcandy case for earbuds works perfect for holding 2 xtra bats and an atomizer with a handfull of carts thats without the black mouthpiece and the plastic white caps jsut the rubber caps. and they do leak but not much at all, to me it is quite tolerable(havnt tried this wit the coffee filter carts yet tho so im not sure if they leak more or not) i hope this helped and im sorry for the poor grammar
