DH doesn't, except when commuting on the train, when he uses a ripstop sling bag to carry lunch and an umbrella. (He has a company desktop at work so he mostly leaves his laptop at home, just moves files back and forth on a thumb drive.)
In theme parks we have a "family" backpack that gets passed around and carried by different people in turn; it contains ponchos, a couple of hats, sunblock, Body Glide, some protein snacks, a couple of power brick batteries, and a large plastic ziploc to stash our phones and batteries if we go on a wet ride. We all carry half-size steel water bottles on belt biners, and sunglasses on croakies. DH loves fishing clothing for his weekend wear, and always wears it to the parks (which is kind of amusing because he doesn't fish; he just really likes the utility of the clothing. I *do* fish, fwiw.) Fishing wear has LOTS of pockets, and odd little utility touches like a velcro strap over the pocket to hold sunglasses in place.
DS26 usually carries a smallish cross-body tablet case back and forth to work. He's also fond of fishing-wear, and tends to put all the pockets to good use the rest of the time. (He does live in coastal Florida, where fishing wear on men is pretty common.)