I carry mine is a flashlight case upright,no leaks,but will admit it does ''seep'' a wee bit if i carry it in my pocket on its side if i walk with it.I just started filling mine from the bottom as usual but now i cover the air hole after i screw in the screw and then i hold my figer over the air hole ang tilt upright,for some reason it seems to help it it not ''leak.I also cover the channels buy ''stuffing'' the wiks lightly over the channels,this works for me.And i keep the coil above the air hole as high as possible....ima happy camper.5 wraps at 28 gauge gets me 1.3 ohms micro coil.For some strange reason,RY4 tasted muted in the KFL but all other juices are excellent.I use my Kraken,SS cable for RYA....and visa versa.