I use a product called Skin Tac for my insulin pump and glucose monitor. It's a really strong adhesive that comes in swabs or a bottle. I hate using the swabs so I use the bottle. The bottle is 4 oz though. I should be able claim this as a medical liquid. I don't think that will be a problem in the US, but was concerned about at YYZ and CDG.

I'm thinking of putting it in my quart bag and not saying anything. At 4 oz it doesn't look obviously large. If I get caught, I can still claim it as a medical liquid without too much trouble, hopefully. I can probably scrape off the size on the label. I could also just declare it as a medical liquid upfront. I wasn't sure how strict they are in Canada or France, and with a possible language barrier issue at CDG. It's not a liquid medication but it keeps my insulin pump and glucose monitor from falling off at inconvenient times.