So, before I really start looking for a pack, I should buy all the equipment that I need? Then see how much stuff i have and get a pack that fits. My problem is I have no idea how much stuff a 3300 cubic in. pack holds compared to a 4500. I plan on doing a few weekend hikes, 2-4 days. Is a 3300 cubic in. pack suitable without being minimal? It just seems like with an internal frame pack, the sleeping bag and tent are going to take up the vast majority of the room. Then I still need clothes, food, etc...

Thanks for the comments! I'm on a pretty tight budget being a broke college student so I want to make sure my first purchase is going to be the right one! I cant afford to rebuy gear. If i could, that would be a great way to find the gear I want! Thanks again!!