This Horween leather wallet from Nomad hides an iPhone backup battery - The Gadgeteer
Nomad Card Wallet Plus has thermoformed leather, providing plenty of space for your cards » Gadget Flow
Amazon.com: Nomad Rugged Folio Wallet Phone Case for iPhone 12 Pro Max - MagSafe Compatible, 10ft. Drop Protection, Horween Leather - Black : Cell Phones & Accessories
Nomad Horween Leather Charging Wallet - IMBOLDN
Charge Your iPhone with Your Wallet! Nomad Wallet Review! - YouTube
Hands-on with Nomad's Horween leather wallets with integrated battery and Lightning cable [Video] - 9to5Mac