Superior Spider-Man Backpack

Edit (6/5/19):
Made a new version using Fusion 360. Changed the design quite a bit to make it sleeker and hollow to potentially carry small items like your phone and Con badge.

Not sure if it will print right, but check it out here:
https://www.thingiverse.com/thing:3673277

Edit (5/31/19):
Printed the file finally. It was not flat on the bottom all the way (sorry still a beginner at modeling). I made it flat by lowering it 4mm below the print bed. This fixed the level of the back and allowed it to adhere to the print bed much easier.

There are weird lines all throughout the model. I am not sure if that has to do with the size I modeled it in blender or if there is some function to remove the lines and make things smooth. Any suggestions here would be appreciated. I did not expect these textures and don't know how to fix them. I will just fix it when I move into the finishing stage for this prop, but changed this file to a WIP until someone is able to fix it.

I tested th