FrugalFannie
NES Member
Saw this posted on whiteblaze.net. While it isn't a good idea for actually backpacking, it would be a good idea for keeping your GHB/BOB secure in your vehicle.
http://www.amazon.com/Pacsafe-120-Anti-Theft-Backpack-Protector/dp/B004RJWFZ8#customerReviews
http://www.amazon.com/Pacsafe-120-Anti-Theft-Backpack-Protector/dp/B004RJWFZ8#customerReviews