Most backpacks are designed to be unisex but there are some physiological differences between men and women. If you’re going to be traveling far and wide with your trusty backpack, you may be wise to look at either men- or women-specific backpacks.
For example, women’s shoulders are usually narrower, their torso is shorter and women’s hips are differently shaped to men’s. Since comfort is everything when you’re on the road and your world is contained in your backpack, it may be worth taking a look at gender-specific backpacks to see if one or other suits you better.