timbuk2 jameson backpack Flight 1077 BP Jet Black - A dedicated rear Timbuk2 Never Check Expandable Backpack,

It can also carry a 13-inch laptop with a case (although the lack of padding in the bag or a dedicated laptop sleeve means that it will have a lot less protection, so I would only do this if you have a hardy laptop case)

If nothing else, when the fishings slow and you go into Homer Simpson mode you can be entertained: The exciting movement and splash will make you think you are getting bites all day, according to the seller

The Mystery Ranch 3 Way Briefcase (Expandable) is a briefcase, messenger bag, and backpack, although it has clearly been designed to work as a briefcase first (due to the layout of the pockets)

Inside with slip pockets on all sides and 3 leather slip pockets on one side