I'm not sure if any of these "notebook sleeves" are really meant to be used to place inside a regular backpack with books and stuff. You always read descriptions about how they're a great complement to a laptop backpack or something. I know a laptop bag defeats the purpose of the slipcover, but I don't think its really meant to be put in my flimsy, regular backpack with no cushioning at the bottom of the pack.
I guess you can do it if you want, but I'd also invest in a better backpack for myself (not necessarily a laptop backpack), maybe one that's generally more padded, especially at the bottom.
I treat my backpack quite rough. :meh: