I've been using my dinky backpack around the city, and want something where I can throw in groceries, an extra pair of clothing, my laptop, and books for school. I need a bigger comfortable bag. I have been eyeing the ortlieb messenger bags, but noticed they are kind of expensive (120$, can't find one used). I will throw down on one if people recommend it, and if it's great for both utility as well as comfort. I use my bike to get everywhere in the city so transporting goods I've found is important nowadays. Thanks for the tips!