>>3I like to read ebooks and surf the web when I'm outside. Can't do that as easily on a small screen.
>>4A.Get a backpack
That's overkill. You can't take a backpack absolutely everywhere like you can a fanny pack. Plus I have PTSD from wearing a backpack in high school.
B.Get rid of non-essential items
So I have to choose a non-essential item between my keys, car keys, phablet, wallet, wallet #2 (diversion for mugging scenarios (only has $20, empty gift cards, and a GPS tracker)), coins, concealed carry, bluetooth headset, breath freshener, baggie of emergency aspirin in case of a stroke, hand sanitizer gel, and a handkerchief. Nope.
C.Get suit with moar pockets.
If you wear a suit everyday you're either a poor scrub (used car salesman, enterprise quality manager, or trial lawyer) or a Forbes-listed executive with a country club membership. Guess how I know which one you are.