The size is perfect for me, it fits 1)my portable Wi-Fi 2)my iphone 6S+ 3)my wallet 4)two Mini charging cables 5)lip balm and 6)my power bank. My only problem is switching between the backpack and the side strap styles; the straps need to be shortened when I use the side strap style, but it’s hard to adjust the straps, and then i have to adjust them again to be a backpack. It’s really good if you just use one style and never change the straps (every time I do it feels like I’m damaging them). ItSee full review