I am sure that everyone struggles to find the right backpack. The "must-haves" are always different from person to another. I use my backpack as a "purse" and as a carry-on for traveling. I have found a perfect backpack for me. There is room for two Yeti bottles, laptop, battery backups, electronics cords, and my daily planner, plus pockets to slide my phone and wallet into. After loading all of those things into the backpack, there is still plenty of room for toiletries and a change of clothes. My cat uses it as a bed, until I can travel again.