Just Google "women hunting backpack". There is quite a bit of information on them. Here is an example:
http://www.kelty.com/c-1-backpacks.aspx Also check rei.com They have a lot of women's backpacks. You don't have to necessarily have a camo backpack. Something earth tone would work just fine. For the long haul, comfort is much more important than color. Remember, deer don't see color as we do. Just get something out of their spectrum.