Super affordable backpacks from High Sierra. https://www.amazon.com/dp/B0789595S5/ref=cm_sw_r_cp_apa_glt_fabc_VP3VXVQYK1HATYFJAZJK I used something like this all the way through high school. Got one at Ross and bought another one after another kid at school yanked on the carry handle as I was walking and ripped it wide open. Second one is still going strong carrying guns and ammo to the range. Edit to add that I rarely had time to stop by my locker so I carried literally all of the textbooks I had to bring to class in one of these. I don't think it's quite this model though. Look for some kind of day pack because the first one I had had a little hideaway rain fly that stretched over the top from a pocket on the bottom.