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Debit card? What's that? All joking aside, I actually did just this back in November! I have a slim leather wallet-back phone case that barely fits my dl, Platinum, and CSR. I am incerdibly fond of it!
https://www.amazon.com/gp/product/B076B5T9GC/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1
1. Amex BCP 2. Marvel MC
Covers me for Food, Gas, Video Games, Entertainment, Which represents about %90 of my swipes
Looks like most people lean hard one way or the other...a set of cash back cards, or a set of travel-focused cards.
Not a challenge at all since I only have two cards in my wallet as it is.
Chase Sapphire Reserve and Chase MileagePlus Club.
American Express Gold PR and the Chase Sapphire Preferred where Amex is not accepted (mainly my mortagage and HOA). Rack up travel points from the best of both worlds.
People carry only one wallet?