I have been through a few in the last couple of years and my favorite to date (and one of the two I still own and use) is Thule Subterra Backpack 30L [0]. Side

I have been through a few in the last couple of years and my favorite to date (and one of the two I still own and use) is Thule Subterra Backpack 30L [0]. Side zipper for laptop to get in and out easily with a large main compartment. Feels great and so far has been pretty durable. Doesn't have an easy access pocket, but the slide zip for the laptop makes it a win for me [0] https://smile.amazon.com/gp/product/B01N0ZLG5F https://smile.amazon.com/gp/product/B01N0ZLG5F