After a long search for a wallet that won't turn my body into a twisted mess when I sit, I think I've found it. The assembly is very easy. They are essentially two flat, credit card-sized pieces of plastic held together with a thick rubber band about 3/4 inch wide and a small "lip" or "rail" to hold the plastic together. The minimum and maximum number of cards I noticed is required to keep the wallet functional. I would recommend using at least 6 or 7 cards and no more than 10 or 11. I use it to keep my balance, library, Sam Club, and gift cards together, and keep cash and ID on the outside of the wallet. The full depth of the wallet is no more than 3/4 inch thick even when I'm holding a decent amount of bills. Sometimes it's hard to tell if I have it in my bag or not, which can be a plus or minus depending on your needs. For my needs, this is a wallet to buy. I will definitely be buying another one if the need arises, but from the looks of it it will be quite a while before it will be needed. A small downside is that it's not that easy to access the cable in the middle, as you have to pull out all the cards slightly and reach for the card you want, but having little notches in the plastic at both the bottom and the top helps it to solve problems.
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