Plastic Safety Locks and Seals / Tags

Apologies if this question has come up before… could someone guide me toward those plastic security locks that can swap out a padlock… The main thing is they shouldn’t display ‘Locked up’, ‘Keyholder’, or ‘This isn’t quite normal’ on the surface… (Wanting to keep the level of weirdness low. It would be great if we could stop the padlock from digging into Her while she sleeps. Swapping in a plastic lock sounds good, provided it doesn’t have some ‘weird’ text printed on it…) Appreciate any help!