I used the catalyst for several hundred miles, I personally did not like it nor do I understand the ULA love. It was very uncomfortable. The lumbar pad was very hard and felt like a hard lump just digging into the small of your back. The hip belt strangely did not full wrap (there is a couple inch gap between the lumbar pad and where there padding of the hipbelt starts) and was much thinner than the lumbar pad so all the weight was concentrated in a small area in your lower back. I remember a day in Zion where I had to carry a lot of water, it was just aweful the way the pack was carrying. If you want a larger, lightweight pack to carry a load for 3 pounds go with seekoutside
https://store.seekoutside.com/
There is just no comparison, their suspension is much better and more comfortable for carrying weight and once you use a pac with xpac in the rain you wonder why anyone could make a pack out of anything else.