Thank you so much for taking the time to write a review for your Metro Card Holder. We take your feedback seriously and appreciate it. I do suggest putting 2 cards into each slot (even if it is snug) and you'll see that after a few days the leather will stretch to accommodate your cards. The more you use it the better it will get.
The vegetable-tanned leather we use is the highest quality and will stretch to fit all your cards :) I do hope you'll try it, and rest assured if you have any issues you can reach out directly for another solution.