I homebrew beer, and I get my bottles by de-labeling stuff I buy. However, I tend to forget what state they’re in so I designed my own label holder with slide in labels. Cardboard boxes hold bottles well, but they’re not see thru. Now I know! STL: https://www.printables.com/model/562504-hanging-sign-clips
Valid question. As others have said, it’s for change ability. I do write in sharpie on the box for the box capacity and contents. However, I have 3 or 4 of these boxes and I swap around the stuff in them a lot. It’s always bottles but sometimes the box is full, sometimes not. Some bottles are ready, some need de labeling. This way I know at a glance what the status of my inventory is.