Hello Backcountry Forum!

I am a long time hiker/backpacker but I am planning my first longer self supported trip. I have a Kelty Pawnee (3300 in^3) and I am wondering if you all think this is big enough to carry my share (4 of us on this trek so we'll share the burden) for a 5 day self-supported trek.

We will not be bringing a tent as there are huts strategically placed on our planned route, but will be bringing tarps in case things go wrong. Also we will not be carrying our water (we'll have access to fast-flowing water throughout).

Should I buy a bigger pack?