I alway thought the Colster was too wide to easily hold so I made it into a mug. I have included 2 models. cuptomug will need a bit of shimming behind the top ring. (I used a zip tie.) cuptomug2 will need a bit of sanding or Dremel work to get to slide past the Yeti logo. I prefer cuptomug2 it fits better and has an extra support bar.