I like a game cart idea the work good depending on terrain if it’s not relatively flat they suck.
I have been looking into bike trailers that would be the ideal way to go depending on your situation I would plan on fully loading it up probley would want more than 100 lbs on it.
My thoughts were to throw my heavy bob on it with mostly extra food and a larger water container than wear a smaller bag on person with Incase you have to ditch the bike in a hurry and also have a small load out of ammo on me.
I used to use a bike trailer exclusively to shop with and go to the laundrymat.
Go to Wal-mart (or Craig's list) and get the bike trailer used for little kids.
Assemble only the frame and wheels, and throw the rest away.
Use oven racks and plastic zip ties to make a platform on the trailer. Oven racks can be had for less than $10.00 at a used appliance shop.
Then, drill holes in the bottom of a big, Rubbermade storage container, and use zip ties through these holes to mount the container on the platform made by the oven racks.
Please note that oven racks can be sawed to fit with a dollar-store hacksaw.
Follow the directions for putting the trailer hitch on the bicycle.
I was in a financial hole at one point in my life (it happens to the best of us, so please don't judge), so I did away with my car.
My bike trailer worked perfectly to go shopping, to go to the laundrymat, and to transport my cat to and from the vet.
Please note that this worked for me because Florida is tropical (I could do it year-round), and because Florida is flat.
It is important to put a blinking red bicycle safety light on the back of the trailer. Duct tape is good for this.
I could haul 50 lbs. bags of cat litter, a week's worth of groceries, 4 gallons of bottled water, and so on.
This lifestyle may have been eccentric and strange to some people, but I saved huge amounts of money and got in shape at the same time. The exercise also helped me become more productive at work.