If you use frequent but not daily eye drops, I suggest looking for packs of single-use droppers. They're marketed as sensitive -- they have no preservatives, so you have to throw them out within a day of opening, but it saves you from tossing a full-size bottle every month due to worries of germ growth.
Mule (smuggling) For other uses, see mule (disambiguation). A mule or courier is someone who smuggles contraband across a border (as opposed to sending by mail, etc.) for a smuggling organization. The organizers employ mules to reduce the risk of getting caught themselves.
a group of things wrapped or tied together for easy handling or carrying; a bundle, especially one to be carried on the back of an animal or a person: a mule pack; a hiker's pack. 2. a definite quantity or standard measure of something wrapped up or otherwise assembled for merchandising (sometimes used in combination):