The wallet

--- What you need ---

You need a 23/25mm elastic band

--- Design options (What to print) ---

------ Single drawer 

• Drawer cover
• Drawer
• Single panel

------ Dual drawer 

• Drawer cover (x2)
• Drawer (x2)

--- Print suggestions ---

I suggest printing with 20 bottom layers so it gets 100% monotonic infill; print drawers on a smooth sheet so it slides batter and with less friction

--- Elastic Bands ---

https://www.etsy.com/it/search?q=25mm+elastic+band

https://elephantwallet.com/collections/accessories/products/2-x-n-wallet-additional-elastic-band-wood-metal-carbon-fiber

(The second link version are precut bands but they are a bit too tight in my opinion)