Designed this cup holder for my wife's obnoxiously huge Stanley 40oz cup so it's easily accessible and off the sand while at the beach. She wanted to make sure that the cup holder was also supported through one of the holes in the side of the bag. The screw and nut take a bit of work to get on because of the tolerance and Z-seam, but it works. I will adjust later with a remix if necessary. This also works on other drink cups too like our large (32 oz) Simply Modern cups and obviously anything smaller.