I took an empty box from our bathroom remodel project and cut off the "flaps".
I bought argyle, black, and white duck tape and just wrapped it around the box to cover it. I cut out the "Donation Box" label in vinyl on my Cricut and stored the box in my front coat closet. Now whenever I'm cleaning or organizing and decide that something is no longer useful and just taking up space I just put it in the box. I love how helpful this has been in getting rid of stuff!