An interesting concept – to create a vacuum capsule.
Today when we want to stick two parts either we use mechanical systems/ locks or a chemical to bond two parts.
Now with vacuum capsule which can be placed between two parts and can be imploded to create small vacuum between the two surfaces and then the parts stick.
This is useful for the where we do not want to use chemical due to their cohesive nature and where mechanical system cannot be applied due to space constraints.
As this capsule will be contained between the parts themselves there is no additional space needed.