Meet DonkiBot: an auto following robot that carry up to 100kg of your things right behind you. The robot has following and remote control modes. You can simply drag the tethered sensor to allow DonkiBot to follow you and maintain the proper distance. The bumper has sensors to detect any physical contact and stop.
DonkiBot has a max speed of 6 km/h. It runs for up to 4 hours. More information is available on Kickstarter.