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I carry three: two Amex cards and a debit card. The Amexes are for different cashback situations and one of them is a Costco membership card too so I have to carry both. I would actually like to add a backup Visa or MasterCard as well since lots of places do not accept Amex.



I have the Costco Amex too, but how often are you going to Costco that you're carrying it around everyday?




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