I used to be a trifold guy. Finally decided to de-bulk my wallet; so I went to this (well, the first one was leather).
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Two card slots and an extra compartment on each side, sandwiching a center section for bills. Without doubling up, it's good for 4 cards, drivers license, insurance card and some cash...but it would certainly hold more. Unfortunately, I did give in to that temptation and doubled up - adding gas/loyalty cards and who knows what else, until I noticed that it was now as bulky as my old wallet.
That's when I switched to this.
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A slab of copper as the base, it had some bulk from the start. There's a shallow channel under the strap in the back for carrying a few bills; but I didn't like using it. I carried 1 credit card, 1 debit card, my driver's license, and one more thing. (The last card varied health insurance, access card, loyalty card, whatever I was most likely to need - there just had to be a 4th card or it wasn't secure).
Lately, it's been this
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One card and my driver's license, sandwiched in a couple of bills. I like the clip itself; but I'll be going back to a wallet. The bills get sweaty, and messy (wrinkled, folded, torn) where the edges run over the sides of the cards. I could fold the bills differently; but then it would lose some convenience (for me)