I had a look at the link in your last post. It seems like a good idea (there is also another company in Australia working on a similar product), however both products are still in the research stage and may not be available for a while.
Pacsafe's security webbing products are great but many people bring up the hassle of fitting it to your backpack all the time (it's actually very easy to fit, but it is an issue for a lot of people). Also the weight may be an issue if you're trying to pack light - it is a bit lighter than carrying around an extra guidebook.
However Pacsafe have a range of bags that have the security features built into the bag, which eliminates the cumbersome aspect of having to fit the webbing each time you leave the bag somewhere. All you have to do it lock it and leave it. There range mostly has small bags like hand bags and shoulder bags, but there is a duffel bag and a day pack. If you travel light the day pack (
http://www.travelgear.com.au/mm5/mer...ry_Code=SECBAG) may be a good option. It is 25 litres, which is big enough for many people but a lot of travellers need something bigger. I'm waiting for Pacsafe to develop a secure top-loading backpack, once they bring this out I will definitely buy one.
See
http://www.travelgear.com.au/mm5/mer...ry_Code=SECBAG for more information.