The Add a Bag Strap:

Pack more than you can carry—that’s the luxury of this Add-A-Bag Strap, which lets you securely clip extra bags on the top carry handle of any upright, so you can take even more along on your trip. This lightweight and compact solution fit easily into carry-ons, purses, totes and more for versatility wherever you go.

*The strap is adjustable from 8.5 to 13 inches (21.6cm to 33cm)