Well after noticing that my All Purpose Cleaner was leaking in my detailing carrying bag when I had it lying down horizontally, my bag's can't accommodate the 36oz. bottle vertically, I decided to try out by keeping the red caps on. The smell and loss of product in my bag really is a little heartache cause of how expensive these products are, so I decided to squeeze the bottle slightly place the red cap in and let go. This I noticed helps with suction for the red cap that adds extra prevention in allowing the fluid to leak out, then I just screw on the black cap, and have my sprayers placed separately inside my bag with, them labeled to know which sprayer to use for what. I know that it sounds like over kill, but the last tjing I want is to pay $$for something and have half of it accidentally leak out because I didn't make sure the sprayer was tightened enough. Plus, I've also encountered sprayers that just would leak no matter how tight they were on to the bottle.