I bought this wallet as a quick replacement for an expensive leather case I lost while sailing (don't take your wallet on a 13ft boat!). It's so thinner and lighter that I think it will be my wallet for a while. I can leave cash, a license, some credit cards, and some other ID before it overflows. I actually had to put some "backup" cards and papers in a briefcase. Can't rate durability yet, but laminated plastic (mylar-polyester?) seems pretty durable.
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