Bigger cups or travel mugs with handles. Which is why I have it. I have a couple of RTIC mugs with handles and they fit in great.

https://www.amazon.com/dp/B0B3XWXFH9?ref=ppx_pop_mob_ap_share

https://preview.redd.it/n6bcw0rfdiva1.jpeg?width=1170&format=pjpg&auto=webp&v=enabled&s=7d44146e374d689bf1bffb93d6757f17c7698346