In the bathroom stall, if needed. Since only recently, I've started using one per advice from this forum. But I never put my bag on the floor. I've never been to a restaurant where I couldn't put my bag on the back of the chair or in another seat or even on the table itself. Previously, if the bathroom didn't have a hook, I'd try to hang on the door latch, or balance on top of toilet tissue roll, or even keep it on my shoulder and while I hovered and peed. It could be precarious! So now I have a purse hook and it's come in handy in the bathroom. But like I've said, I've never been to a restaurant where I couldn't figure out some non-floor place to put it.