I believe that it would be an excellent idea to issue mini Clipper cards with holes in them that would fit on key rings alongside the current credit card-sized ones. I personally find the standard card to be a bit large and the fact that it does not have a hole makes digging it out at each stop less convenient. I've used both key tag cards and credit card-sized cards and I greatly prefer the smaller keychain versions since being able to put them on keychains makes them harder to lose. Plus if Clipper cards were smaller they would use less plastic.

While I am aware that Clipper 2.0 is in the works and an app will likely replace the physical card for some users I think there are benefits for a smaller version of the Clipper card in addition to having the option of a mobile app and a standard-sized card. What if your phone runs out of juice before you're able to tag on or off or you dropped it or left it on the train? What if you take your card out of your wallet and end up dropping it because it is not attached to anything? Or if someone sees you dig out your wallet out in a station at night and tries to mug you? All of these scenarios could be avoided with the introduction of smaller cards with holes in them. In addition, smaller cards with holes would eliminate the need for people to try and punch their own holes in the card and risk damaging the electronics inside.