Yup! The almighty backpack! If you have back problems, if you lug around heavy things simply out of necessity, you NEED a backpack, son! You neeeeeed it!
THE MESSENGER BAG
These are neither as comfortable as most backpacks nor can they carry as much stuff. But, they're made to be convenient, to hold a fair amount of things and are extremely cute. When you have to pay for something and are in a hurry a backpack will make you look like a fool while you take it off, rumble around in there and find what you're looking for. A messenger bag is right there, probably hanging right by your hand. You swiftly open it and find what you need. When you're done you simply close it and swing it back onto your hip or butt. xD
THE SHOPPING BAG
Grocerie bag that's machine washable - as if that's not the most useful thing anyone who's taking care of themselves and their household could ever ask for. Instead of getting those paper bags that rip and make your produce hit the unbelievably filthy floor, the plastic ones that are not bio degradable and also are prone to breaking, you get these ones - cloth, easy to wash, reusable - porbably will last you foreveeeer. Unless something sharp cuts through them. xD