Brompton Cup Holder Bracket

Edits 1 Jan 2025: In related news, I've been riding more, and my water bottle falls out when there are a lot of bumps. I finally made the time to swap out the two-sided version bottom piece for the four-sided version. Especially since the kids' heads got bigger and they got new bike helmets, so I have more straps. Added photos of the new stitching for the front to back, and also photos of the sides, those are one strap, stitched on two sides. This round we have the straps crossing under the water bottle, I didn't cut the straps because I've had to undo this too many times, so as it is I can just remove the stitching if I mess with it again.
The sticker on the water bottle came from https://themidnightsociety.us/. They're fun. :)
The bracket must have been in the previous designer's work, so I had to make my own. I also modified the design by adding a buckle to the strap, and eventually losing the bottom and related straps for an even more simple final design. So far it works well on bo