For a EDC kit I carry a gerber compact multitool, bic lighter,sharpie,AA maglight (when the LED version gets here I will upgrade)EZLAP pensharpener.Spy sunglasses in a can forces mag pouch, snivel kit with bandaids,tums asprin etc and a antique cigerette case with my I POD with senninhieser earpods and a couple of thumb drives. All this fits in my canadian issue butt pack that some wags have dubbed my tactical manpurse.
sennheiser's are great. i'm using grado sr60 right now. my favorite senn's are the hd485. those two are pretty large, though. also a huge fan of the portapro from koss. it's been around for somethin like twenty years without change in specifications. these headphones are all way less expensive than the knives we collect. i recommend you check em out and upgrade from the earbuds. if you want isolation on the cheap, akg k26 or k27.