Cyclists wanting to notify other road users of stopping or turning intentions can use their arms, but it's not always convenient or safe to do so. Bike-based blinking technology like the Spooklight system
is a good way to go, but having to detach and carry your lights between rides to keep them out of the hands of opportunist thieves can be a bit of a pain. A sleeker idea would be to integrate a wirelessly-controlled lighting system into your backpack? That's precisely what SEIL from Myung Su Lee does. Bright directional arrows, stopping signals or custom animated text messages shine through the fabric at the back of the bag at the press of a button on a bar-mounted wireless controller.