Hi Vanessa,

Any pack with a frame will, more than likely, NOT fit in the tzip.

When I paddled on the Colorado for ~70 miles, I used the tzip, but my pack itself stayed outside of the tubes. https://pmags.com/on-the-south-east-utah-group-seug-circuit

I use the Catalyst for trips with my partner and the Circuit when solo.

A frameless pack may fit in the tzip, but it does not have enough support for most people with heavier packraft gear, days of food, and the amount of water needed for desert hiking, I suspect. I schlepped a poor person’s packraft (Intex 200) with water and food, and it worked OK, but certainly not something ideal. https://pmags.com/wasu-overall-thoughts

Please let me know if you have addiional questions.