A built-in bike security system

Touted as "the biggest bike lock innovation... ever" and installable on virtually any make & model, The InterLock's a low-profile, anti-theft cable rig concealed within your whip's seatpost that'll secure it to any rack, fence, or pole as effectively as a traditional cable lock, but since it's built in, will prevent you from getting all Huffy by accidentally leaving it at home

Once it's swapped in place of your existing seatpost, simply tug on the two hidden 20in cables and feed them through the rear wheel and the stationary object to which you're securing it.