One minor tip that makes a great difference to how useful the Instead cups are, is that you can "burp" it, pardon the grossness. Another way to say this is: you can empty it without removing it. This same action works to break the suction, when you do want to remove it. Great for places where your hands aren't clean in the first place, such as a ride, or a hike, sailing. You are basically covered for a whole day of activity. I don't think they are meant to be re-used, but I suppose that would work too.