I got a Jansport which is NOT designed for photography...but has nice wheels and a handle that pops up I then put one or two of my camera bags in it,and still have a seperate compartment or two for a sweater, snacks..whatever. I'd taken gear to a big bluegrass fest in SF before and had a smaller daypack and a heavt shoulder bag for gear, and it was a load. This.....rolls, even on dirt paths. I also can wear it as a backpack, or take out the camera bag and move about. had a body, a monopod,a 500 mm Mirror, a 135 mm 1.8, a 60-300 and a little 28 mm. I also had a small cooler with 2 cold beers, 3 burritos, a dozen chocolate chip cookies,a warm sweater and whatever...plus a folding chair that did not fit inside...but I could pull the pack with the chair bungied to it, one hand. Since it was nearly a half mile from the car to the stage..that was good. I'd like to use it on a Point Lobos photo trip. Last time I did that I hiked 10+ miles and was beat.
This Jansport was a yardsale inspiration..cost me $6. It's PERFECT.