..so what do you use, one that goes around your pack to a pole. What if there is no pole!

I'm paranoid of having my back pack leave unbeknown to me before I do! I've had them walk before and have invested in cable mesh locks before which just work well. This one incorporates a 95 db piezo screamer if moved! So if I'm settling down to lunch and someone gets too interested while I'm relaxing.. BIFFO!

Targus Defcon 1 Ultra - Security Alarm cable lock

Retractable Stainless Steel Cable: 2.3 mm diameter; 0.9m long
Electronic Alarm: Loud, 95db alarm siren arms when lock is engaged. Alarm activated when cable is severed and when motion sensor is armed and triggered. Alarm is deactivated when combination lock is released.
Motion Sensor: High and low sensitivity modes. Triggered when device is moved. If motion continues for 4 seconds, alarm will sound for 40 seconds, device then resets to “armed” status.
Combination Lock: Controls lock, electronic alarm, access to battery door and motion sensor. Re-settable to one of 10,000 unique combinations.
