check your local college for a backpacking class. you can learn about several type of backpacks and even try them out in class. if you are looking for a hunting daypack, look at the yardsales this summer, some can be had for less than $5.00. load them up and walk with them to see what fits your needs most. just remember junk accumulates to fill all space provided, don't turn yourself into a packmule with junk you don't need.