Okay... my goal is not to embarrass you here.
I want to save you from the embarrassment I went through when my husband pointed this out to me....
You know those "disposable" salt and pepper shakers from Morton?
I used to get these and when they were done, I would throw them out. Till one day my hubs sees me doing it and asks why I didn't just pop off the top and refill them. HUH?!? The top POPS OFF? That's right... just pop it off and refill.
Now you know... and knowing is half the battle. : )