Oh, that reminds me, I was pretty curious about the fact that there are men's and women's backpacks, and apparently women's backpacks are actually kinda different from men's backpacks

Here, from the Jack Wolfskin website (I know, different brand, but I assume it's similar):

Backpacks & Bags What’s the difference between women’s and men’s backpacks?

All of our women’s pack models have a smaller capacity than the corresponding men’s models, as women usually have a shorter back. In addition, our women’s packs have different attributes, depending on the intended use:

Alpine, tour and cycling packs:

Shoulder straps have a more acute angle in the neck area
Shoulder straps have a narrower curvature and are set wider
Shorter shoulder straps
Shorter overall length
Shorter waist belt (if included)

Trekking packs:

Shoulder straps have a more acute angle in the neck area
Shoulder straps have a narrower curvature and are set wider
Shorter and narrower shoulder straps
SOFTNECK padding extends around the edges of the shoulder straps (more comfort when wearing a sleeveless top or vest)
Shorter overall length
Shorter, wider and more steeply angled waist belt wings

It's based on averages though, so a tall woman with a wider build would probably have a better time with a men's backpack and the same goes the other way around. You just gotta know what's right for you, because they are actually different. So this likely isn't actually based on the color of the backpack, although if it is only available in pink and other red-ish tones, that is obviously stupid.