My sister asked for a small go bag that would fit a single book with room for the typical things (cards, phone, mints). I’ve browsed some options(including bags that incorporate a book strap) but wanted to check what other people who carry books around typically prefer before committing to something.
I really love my Patagonia Atom sling bag. It’s basically big enough for a book or ereader, phone and a water bottle. Great for when I don’t want to carry a full backpack around.