When considering lotion, I've experienced an array of cap designs, and the most frustrating is probably the most common. I'm not sure why since it makes little sense, but it's probably a matter of what is most affordable.
This is one of those frustrating - yet common - caps.
It's a basic screw-on lid that works perfectly fine to open and close a bottle. However, when considering the contents, that's when it doesn't make sense. After squirting lotion into my hand, I'm faced with the dilemma of putting the cap back on, while I have the contents in my palm. If the lotion is thick it's not too hard, but if it's runny, I wind up with lotion either on the bottle, or dripping onto my clothing.
Here's the kind of cap that I like.
This is a flip-top that is brilliant. I can flip the top open, squirt lotion into my hand, and close the bottle again easily with one hand. No lotion on the bottle or on my clothes.
Obviously in the great scheme of life, this is a pretty trivial thing. But when considering design and user experience, it becomes a bigger issue - one of ultimately pleasing the user (or not).