Review on Secure Your Devices on the Go with the Kensington Portable Combination Cable Lock - Red (K64671AM) by Mark Taylor

If you spend hours commuting on public transport or moving from hotel to hotel, this cable lock will come in handy to prevent nimble fingers from stealing your laptop, but worse, it'll disappear with years of data. The cable is designed to wrap around a fixed support (rail, pipe, bracket) and the lock fits into a "security slot" found on most laptops. It is no problem to pry the lock out of the groove or out of the attachment point. So it's a visual deterrent to accidental theft, but nothing more. When I'm in a hotel, I either lock my laptop in the room safe or leave it in the hotel safe.