If you frequently have to tour your workplace scanning everyone's desks for your mug that you washed up and neatly put away the day before then the Plug Mug is for you. Just keep the plug in your pocket or on your keyring and remember to insert into your mug each time you have a drink.
If you have a Plug Mug it will hopefully be in exactly the same place as where you left it. Nobody will want to use your mug, and if they do they'll probably get coffee all over them. Just remember to remove the plug from your mug each time you have finished your drink. It will now be safe to leave your mug in full view without having to worry about anyone stealing or using it.
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