I take two accordian style plastic file folders with me, one large and one the size of a business size envelope. I use them for putting memorabilia things in, like the hotel newsletter, park maps, the kids activity things, etc. I take the small one with me to put the things I collect during the day, then empty it out into the big one at night. It is lightweight and it keeps those things safe and organized. And it fits really well in my backpack. I am a scrapbooker and I collect a lot of things to use in my scrapbooks.