I like to buy view binders and take a trip to Michael's scrapbook paper aisle.
I purchased these folders at Target for a little over $1.00 each. There are 12 in the binder.
I keep a quick class list on the inside and write in grades as I grade work.
I use an online gradebook, but this gives me a quick glance to see who still owes me work.
One assignment goes in a folder and is placed at the front of the binder.
I created a page with laminated cardstock that says "Graded Papers". When I finish grading something, I move the folder from the front and place it behind this page. When I get to school, I can just pull out any folders behind this page to hand out or file.
I keep answer keys in the back of this binder for the marking period. There is always a need to grade something later (from an absence or late assignment). This way, they are all in one place.
My binder isn't fool-proof, but I like that I can take the whole binder home, or just pull an assignment if I'm in a rush. I can also grab a folder to take to meetings if we have downtime.