Well... i own the Quatro Wallet by Eran Blizovsky, and Number 4 enveloppe is not so good than the
Quatro Wallet (yes, it's not the same price). But the system to open the enveloppe is not so
clean... The Tyvek's quality of Number 4 enveloppe is excellent, the Blake Vogt's video too. It's a
good product, worth the price ! But the Quatro Wallet is much better, cleaner and made of a really
good leather.