It may soon be easier to find a shoe rack or shelving system at The Container Store. Employees at all of its stores will soon ditch their walkie-talkies for voice-activated wearable computers made by Richardson startup Theatro. The tiny hands-free wearables answer questions, similar to Siri or Amazon Echo. But the devices — which are about the size of a matchbox — also allow employees to communicate one-on-one or in a group by using software that’s connected to a Wi-Fi network. That means a Container Store employee can search inventory without looking at a computer screen, find a coworker who’s in the stock room and ask him or her to bring that item to a customer.