The Booksling by Everyday Innovations is a very practical and helpful tool that I had the chance to use while on my recent flight to CA. I dont know if it technically fits into the office supplies category, but its close enough for me, maybe its a reading tool? Either way, no matter what you call it, I really like this thing.
Basically the Booksling is a heavy duty elastic strap that goes around the cover of a book or journal, and it has a one pen holder loop on each end, and also a bookmark attached. It is best used with a book that has a more stiff or hard cover, I tried it on a Junior Sized Levenger Circa notebook with the translucent cover and it was a bit too tight for that, and it caused the cover to buckle a bit. If you want to use this on a regular hard cover text book, or something like a Rhodia notebook or journal it is perfect though.
The nice thing about the Booksling is that for someone like me that is kind of unorganized when they travel, is that it helps to keep things under control in situations where you have to pack up your stuff and be ready to move around quickly. In the past when I was at the airport reading a book waiting to board my flight, Id just stuff my boarding pass or who knows what in the book, then Id be constantly taking it in and out to see what seat/row I was in, not to mention shoving a pen or highlighter in my pocket only to have to fuss around after I have my seat belt on to retrieve it. So with one simple tool, you have two pens with your book at all times, and you have a nice little bookmark. One additional thing is that you can also use the elastic strap to tuck a few papers under as well, so instead of just having them inside the flap, you can have them inside the flap and under the elastic to help make sure they wont slip out.
This is a pretty simple $5 item that can really make a difference when it comes to keeping yourself a little more organized and put together if you are traveling, or on the go. Everyday Innovations seems to do well when it comes to helping simplify things for the student, office worker, or traveler. They also offer the Booksling Mini that comes with a pen, but no bookmark. That version will fit on notebooks that measure about 3″ x 5″.
Note: I forgot to mention that the bookmark portion of the Booksling is available in multiple colors, so when you search for it on Amazon or wherever, be aware that you have other choices.