Reduced where?
Paper straws are such a nuisance how quickly they get wasted, that it is rather easy to find 1 euro shops selling "classical" straws.
Bottle caps being tied to the bottles hardly matters, it is quite common to see people in parks or at the beach, breaking the cap from the bottle to split them as always.
Then supermarkets still deliver most of the goods from several food areas in plastic containers for the most part.
What is worst is lack of education from most people, that throw away their garbage all over the place, regardless if it is paper, metal, cardboard, wood,....
This is the problem that paper straws hardly solve, other than what, I feel good when those people "forget" their paper straws on the beach and camping ground all over the place?