Binder method, I use pockets that are made for card collectors.. heavy duty, various sizes as little as two large pockets per page (good for big categories with lots of coupons like cleaning, cereal, toothpaste, shampoo), three per page, others have 4 per page.. no need to fold!
I sacrifice a page protector by cutting it in half.. big pocket. Top half is now useless as it has no bottom.. but these are cheap in bulk packages and easy to find if you don't have a card/comic shop in your area.
I put "like" category coupons together.. all the cereal is in one pocket. One page is just dairy broken into cheese, milk, juice in its pockets. There are several coupons in each pocket.. if I did one pocket per coupon I would need more binders!
As I cut, I sort into broad categories: dairy, canned, meat, personals, cleaning, wraps/zips, organics, etc. Makes it easy to file into the pockets.
Once a month is the pain of pulling expireds.. but I keep my expireds in another small box with index dividers. (One of my local stores takes coupons up to 3 months past expiration.)
I cut everything, even if I am sure I won't use it for myself.. if it's a freebie, it's potential "filler"!
I hold onto the coupons if they are high value/ freebie potential. For example, I bought canned dog food as "filler" to meet my dollar requirement to double coupons. It was free after coupon, let me double coupons on things I needed with low out of pocket. Gave all the cans to my unemployed SIL so she can keep her beloved pets. Score for me and SIL !
I'm intrigued by the insert method and I attempted it for awhile. I used less coupons because I wasn't aware of what I had and what was used up. It's odd but the process of cutting and sorting triggers a memory file in my head.
What about printables? How do you file those? It makes sense to print as the coupons appear, the high value coupons usually run out of prints quickly.
What about peelies, tear pads, blinkies, home mailers? Do you have another file box for those?