I am going to a Library sale tomorrow and I got to thinking about the last one that I went to.  I had a hard time carrying a box for the books and looking at books on the table.  What does everyone else do? Thanks

I have those grocery bags that have cardboard on the bottom so that the books stack nicely and when I fill it, I usually put it off to the side somewhere.  I usually take 3 of those just in case.

I see a lot of people that use a pull cart that they put their boxes on. 

Yeah, I was going to say that I invested in a pull cart, mostly for the library sales, but I've really come to appreciate it when I have a lot of books going out and I have to make a PO trip as well:P  Walgreen's always seems to have a nice selection, and you could probably find one that suits you at Walmart as well.  I got one of the folding plastic crate style carts, but I saw one right afterward that I liked better:P  It was more of a slimline cart and it had a rectangular shape (and not the metal basket style - it had soft vinyl sides), with the bulk of the storage space being top to bottom.  That one would have been more handy at the library sales, where aisle space is at a minimum.  Mine is almost perfectly square and takes up a lot of aisle space, so I end up leaving it at the end of the sale tables, and toting armloads of books to it when I can't carry anymore and still have a free hand to sift through the stacks with:P  But there's nothing worse than having to squeeze through crowded aisles dragging a bulky cart behind you:P

I just take several big cloth bags - beach bag size. 

I just double up paperbags - in fact, the massive sale I go to every month has bags available  as soon as you walk in the door. That's what most people do - and I see some of the same people every month. :)  Some have canvas totes but very few. No pull carts that I've seen.

The great thing though is that if we buy a few bags of  books (like we're prone to do at the twice yearly $5 a bag sale)  the FOL has Radio Flyer wooden wagons to borrow so we can haul them out to the car! lol I love that part of it. Makes me want to buy one for nostalgia reasons.