The Joolz Aer/Day/Hub/Geo3 Cupholder Cupholder is the must-have stroller accessory while youre out and about and is compatible with the Joolz Aer, Day , Day2, Day3, Geo3, Hub, Hub and Hub2 perfect for bringing along bottles, sippy cups and mugs. Easy to install and remove, the Joolz Cupholder remains stable and secure at all times. Simply adjust its position to make sure your drink stays upright.