This thing is f*cking tight, love how easy it is to refill. On thing i wasnt expecting is that the bottom doesnt lock when screwed in all the way- it would loosen. Not sure if it was manufacturing flaw. This happened while in my pocket and caused a lil mess but i caught it early and all my pants are covered in paint anyway so it doesnt really matter. Threw some tape on that sucker and now it rocks through all my bad man tings.