Greg Gavinwrote a review of Pacsafe Anti-Theft Backpack/Bag Protector on July 21, 2016
Familiarity: I've used it once or twice and have initial impressions
The bag protector is a really good design, and from my initial impression well worth it. You do need to practice setting this thing up once or twice before your trip, and time is of the essence. I found that once you learned how to set it up, and the small nuances that deploying it became quick/easy but still a little bit of a pita. That said I'll take a little bit of struggle to protect my belongings when I'm traveling abroad.
Would recommend to others for sure.