Minimalist two-sided touch wallet for one-handed use

~90mm/~3.5in hair ties (2)
25.4mm/1in elastic
 

Print two of “notches” and two of “no_notches”. Assemble two on each side by tying them together with hair ties and securing the bottom slits with elastic (sewing recommended). Chamfered edges should be facing in. 

“Notches” has notches at the bottom so that you can distinguish between the two sides inside your pocket and take a card out/put a card in with only one hand. For example, if you have one main credit card that you use, you will be able to take the card out and put it back in by feel while keeping the wallet still in your pocket. Thus, you can free up your other hand for holding something. Chamfered edges help guide the cards into the slots.