This device allows you to attach up to two bottles or several bags to your baby carriage. The bottle heads snap in tightly but can still be removed easily. Both the ring around the baby carriage handle and the connection of the two bottle holder parts have some play so the holder stays upright all the time. Even strong shakes to the carriage (rough roads, getting curbs up or down) are no problem. The holder works for alcohol free beer (as shown in the pic) as well as real beer :) I personally prefer Augustiner Lager, the bigger diameter of the bottles is also ok for the holder. 0.33L beer bottles should not be used at all due to the fact that they should not be bought in the first place!Print it with a high infill rate to make it robust but below 1.0 to allow some flexibility. I printed the bottom part on the side (with support) because it will be stronger in the up-axis later on. Maybe that's not necessary, tell me if rotating it 90° is fine as well.. You need a bolt and a nylock nut (!) to connect the two parts.