Best backpack for photography and school?

Im a full time high school student and I want to use it for my Nikon DSLR with a 18-140mm and a 35mm lens. But it must be able to hold 3 textbooks as well. Not the camera gear and school stuff at the same time is fine too. It would be nice for the bag to carry a little extra with the camera gear such as a towel or snacks. I would like it to be less than $65 (USD) What bags do you recommend? And which bag is the worst in your opinion.

I've done a little research and here are bags I came up with:

Lowepro hatchback 16L

http://www.bhphotovideo.com/c/product/884453-REG/Lowepro_lp36431_pww_Photo_Hatchback_16L_AW.html

Lowepro hatchback 22L

http://www.bhphotovideo.com/c/product/884455-REG/Lowepro_lp36435_pww_Photo_Hatchback_22L_AW.html

Lowepro Fastpack 200

http://www.bhphotovideo.com/c/product/531358-REG/Lowepro_LP35191_PEU_Fastpack_200_Backpack_Black.html

Lowepro CompuDay Photo 250

http://www.bhphotovideo.com/c/product/754821-REG/Lowepro_LP36297_0AM_CompuDay_Photo_250_Backpack.html

If there is any other backpack (NO SLINGS) you think I should consider then please tell me, Thanks!

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