There is so much hatred for back packs and messenger bags and this utmost need to have panniers. A back pack/messenger bag would have been ideal for this. For my messenger bag, I have a box that is half cut out and has been formed to fit my body. It provides a solid base to put more fragile items on while riding. Often times I have a few recycled plastic bags in my bag because they take up no room. I would have simply wrapped the berries in the bag and placed them in my bag and went on my way.