Couponing - My system

I know that everyone has their own couponing strategy, but some of them just seem so complex, I developed my own. :) When I get coupons I go through them immediately and only keep the ones that my family may possibly use (assuming good sales come up) and toss them in one ziploc bag and toss that bag into my diaper bag. That way I have the coupons if I go to the store unexpectedly (not unplanned mind you, just unexpectedly). When I plan a shopping trip I take just a few minutes to run through the coupon bag and put the ones that I am going use on that trip in a separate bag. Tada! All ready to go...no sorting into piles or any of that. I like it, it works for me. Do you have a favorite system?