What are some package design features that you have discovered only recently, but which seem obvious in retrospect?
For example, things that come in tubes, often have a cap that is indented at the top, with a spike-like feature within, that is intended to puncture the foil seal of the tube.
I only realised this recently, and used a knife to poke through it all those years before.
Topic:
product design
Using Fluther
or