Perhaps you have noticed how much is charged for decent individual vacuum hooks.
If you use a lot, then buying a brand name suction hook in a set of 8 is a good idea.
The hook is on a hinge, pull the hook into place when the pad is in position and a vacuum is formed, holding the Snap Hook in place.
You can then hang items on the suction Snap Hook.
When you want to remove the Snap Hook, pull the hook part up an the vacuum is released and the hook removes from your surface.
Surfaces need top be clean and smooth and allow an sir tight seal to be formed. Materials like windows, mirrors, tile, marble, porcelain, fibreglass, metal, formica (not surfaces like drywall, unfinished or lightly treated wood, and rough surfaces).
Video shows how Snap Hook vacuum suction hooks may be used under perfect conditions, as real life is not perfect, it could be unsafe to use them where things may break or distraction caused.