In urban, big city, environments a backpack might look out of place and attract attention exactly when you most want to blend. Depends a lot on the the specific area you travel in. If there are schools or a community college in the are your likely to see backpacks fairly often.

Of course a backpack isn't your only option. Duffel or gym bags are pretty common if there are athletic facilities in the area. It might also disguise your survival kit, something they might want, as sweaty gym clothes, something they wouldn't be interested in.

Diaper bags, a stroller would be an interesting carrier, and the sort of large lunchboxes you see construction workers using are also options. Both are pretty commonly seen in urban areas and things people don't associate with having anything valuable inside. And you can mix and match. A duffel with a shoulder strap and a lunch box might work together.

Wrapping you kit in garbage bags and tossing them into a shopping cart, or one of those folding two-wheel carts, would blend in in most built-up areas. Particularly if the area is a bit run down. Add a scruffy floppy hat and OD green army jacket and your just another homeless guy. At home in any city.

Fitting your kit into cardboard boxes and place then on a common hand truck and your just another delivery guy. Just make a lot of turns to keep the sight line short. So no one notices that your traveling farther than any delivery person would.