Tickets are 20.4*8.3 cm. But e-tickets have to be printed on A4 and it takes a fair amount of origami to fold them so the barcodes are visible and they fit a Club Arnage wallet.
Didn't ever see wallets in the shop of a sensible size/price, or in any of the other places like Super-U that sell EG despite asking last couple years. ACO shop has silly price lanyard/wallets and the wallets (in the past) were not a simple fit for 20.4*8.3 cm tickets.