One of the ideas/products I liked the most was the multiple-cards in one (meaning that you can store multiple credit card accounts or even debit cards, into one plastic, this way you only carry one).

There was a company called Coin doing this in the US but they shut down. https://www.macrumors.com/2017/02/01/coin-shutdown-services-...

A company called Curve is doing this in Europe and seems to be doing quite well. (~$200M valuation). Unfortunately, it is not available in the US.

While many people might say that you don't need plastic if you have your phone and use Apple pay, maybe I am old school, but I still would love to have just one plastic (or metal since nowadays that's the cool thing) carrying all my cards.