Review (5/5): Don't listen to the other reviews
I bought these because a co-worker had some that he received as a promotional item from some company he shopped at. They work great. Just like most of the people have commented in the questions above, when you fill them with LIQUID (not gel) and SNAP the plunger into place they work great! They don't leak unless you spill when you're filling them or fill them too much (overflow when putting the plunger into place). I saw someone ask if they included a funnel. I pumped hand sanitizer right from the bottle into the hole. Some missed the hole and I just used a kleenex to clean it up before inserting the plunger until it snaps into place. Ten pumps worked well for me. Tried 12 with a second one and made it overflow. Poured some out, cleaned it up and it was fine. Great for a man's shirt pocket, anyone's back pocket, leg pocket or a purse.