We got our child, got our stroller, walked to grocery store and back. With the bags.

Of course there's usually room for groceries underneath the seat, but sometimes it's not enough.

This hook was designed to Cybex Priam (-20), but I think it would fit with other models also.

I tested with 5kg weight, works like charm.

My first ever print with PETG (PolyLite PETG), pretty happy with the result.

Inner diameter of the circle is 36mm, the most narrow part of the design is 25mm

EDIT:

CYBEX: own print profile

CHICCO: own print profile

JOOLZ: scale down to 90% 

!!! Fill the bottom room from your stroller first, so there won't be surprise wheelie if the bag is heavy, and the kid is lightweight !!!

Cheers!