i buy every book i can get my hands on, but i think birnbaum is my fave. i use it the most. i dont bring them to the parks though.
for a backpack, i dont like to bring too much so i use what i camm a campus bag, im sure it isnt the proper name, but its just a piece of fabric with usually rope as the straps, you usually see them with colleges on them. hopefully someone knows what im talking about, lol.