In my world, ounces are pounds, pounds are pain. Find the lightest you can afford that will complete your task the best.
Weight
Comfort
Accessibility
Color
Wind/rain/weather proof
Scent (lock if needed)
Durability
Size
Back brace
I look at all of the above when picking my gear. The list is in no certain order, only you can pick what is most important to you. But, a novice may not know what should be most important, not saying you are, just in general. Watch and listen the the ones who have made it back, they figured or something along the way, right?
Have a safe hunt, bring good pictures back with you.
You never mentioned how long you will need it for. That will make a big difference as well. Maybe look into a simple ruck sack like we use in the Army. It meets all if not most of requirements.