Dynomighty Tyvek Wallet

I bought one of these wallets just for giggles and have been using it for a few weeks. A few comments:

Pros:

• it is very thin and light, quite nice for someone who carries a wallet in their pocket almost all the time
• the tyvek is pretty strong and resists moisture
• it's a good conversation piece, quite a few people ask about it
  

Cons:

• though it hasn't caused a serious mess yet, the flaps (ie. the outer/short edges when opened) are simply that: flaps folded inside the wallet ala origami that will come unfastened relatively easily
• the card slots tend to stretch over time and eventually allow the cards to slide freely, which could cause a card spill

Still looking for the perfect wallet...