There are not many things two people can use at the same time. Though, there are some, for instance, tea bags for two:
..which come in a tea cup for two.
From MeetSebastian.com
Or another version of a cup for two by Tonerico Inc.
There are also Smittens for two by designer Wendy Feller. The mittens are handmade in Seattle.
Then there is Tandem umbrella, also for being inseparable. Produced with Jasmine Raznahan.
