Wallet
Wallets are simultaneously generic (almost every guy and alot of girls have one), and highly personal. (In my very small questioning, people are more attached to their wallet than they are to, say, their mobile phone)
Thus wallet design is big business.
Prologue
I am a wallet snob. Sometime around 1999 (for a guess), I bought a wallet. A nice little tri-fold leather number, with multiple card slots, two note sleeves, and NO coin pouch (so: no zips or clips). Result? A small clean wallet which suits my minimal slimline non-bulky (I like to call this style 'efficient') tastes.
Sometime around, oh, probably 2003, I realised I'd need a new wallet one day, and so started keeping my eye out for a replacement.
Cue 2005... I'm pretty seriously looking for a replacement, and by 2006 I'm starting to ask people everywhere. An identical to the one I had would have been perfect. Sadly, not findable.
I started a duct-tape wallet, but quickly realised it would be too bulky. (I stopped half way through making it, when it was already as thick when closed as my empty 'live' wallet.
2007: I discover tyvek and resurrect making my own wallet idea. Origami style. (I have found Tyvek wallets online (both professional and how-to guides to make your own), but none appealed).
Feb 2008: My tyvek prototype1 has been in use for a few months, and now onto prototype2.
Type 1
A tri-fold wallet from a single sheet of tyvek, however requiring tape (duct and/or gaffa) for structure.
Features twin note sleeves, and multiple card pouches, and one extremely-difficult-to-access non-obvious 'secret compartment'.
Note: Tape only holds sides together. The tyvek is a single structure folded.
Type 2
A trifold tyvek wallet made origami style. Tyvek cut to shape, then folded. No tape required.
Features twin note sleeved, and a single card pouch on each side. Secret compartment also features - still non obvious, much easier access.