I have made six, solo, back county hunts to Colorado, Montana and Utah. Your equipment can make or break your experience.
The first year, I used stuff I had or could borrow. Each year I purchase one new piece. My pack, for eight days, has gone from 90lbs to 45lbs!
I also, would rate your shelter system as the most important and expensive. The first year, I used a borrowed bivy. My first night on the mountain, it started raining. It didn't stop for two days! I have never been so miserable in my life! Everything I had was soaked and I was loosing my mind from laying in that nylon coffin for 36 hours! It was 36* and I thought I was going have to pack out without having hunted!
I have since purchased a MSR Hubba Hubba, lightweight, 2-man tent, and a Marmot 20* down bag. I am comfortable in just about any situation (except lightning!!!).