Kensington Microsaver Security Cable (http://amzn.to/bkV7Jd http://amzn.to/bkV7Jd). Coils neatly for easy backpack storage. I work almost every day out of coffe

Kensington Microsaver Security Cable (http://amzn.to/bkV7Jd http://amzn.to/bkV7Jd). Coils neatly for easy backpack storage. I work almost every day out of coffeeshops and lock it to a chair and will walk away for sometimes an hour at a time with absolutely no trouble. Someone will either have to spend 10+ minutes sawing through it or try to steal a chair, which most people will notice.