A wallet made of five Tyvek credit card sleeves, often used to package gift cards. Tyvek is a durable paper compound used for event bracelets and packaging envelopes. Glued together, these five Tyvek card cases make a durable, simple, small wallet. You can simply collect these as you receive gift cars. I actually bought them off ebay for $3 (for all five). This design easily holds eight credit cards and five bills (my current load).