I bought my Demano bag in 2013; still use it today. Made of recycled materials; waterproof by itself(no cover necessary).
Has side pockets; can be used to hold drinks. Will fit a 17 inch laptop.

Have used mine on 100 mile charity rides, commuting in all kinds of weather(summer heat, rain, freezing winter), carry -on
bag on flights, grocery shopping, etc.

Large pizza; tiny bike - challenge accepted by 1nterceptor, on Flickr