Coffee companies such as Starbucks could do well in improving their disposable cups (assuming that they are still using one) with the +4.5 Paper Cup. While the cup looks pretty much the same, this one covers the area of plastic stirrers (or even wooden ones) to allow coffee drinkers an easy way to mix up their concoctions.
This was all made possible with the detachable stirrer which is actually a part of the handle of the whole cup. And as you would guess, that detachable part measures about 4.5 cms, probably the reason why the cup was named as such.
The +4.5 Paper Cup was designed by Hongseok Kim and Inhye Hwang and should somehow address the waste problem that all of us are trying to figure out.