Learn English – What do you call the container that looks like a ‘Pringles bottle’

You could use the 'communal area'

Communal - adjective

1 - used or shared in common by everyone in a group: a communal jug of wine.

2 - of, by, or belonging to the people of a community; shared or participated in by the public: communal land; Building the playground was a communal project.

www.dictionary.com

Part of the difficulty is that a general word meaning "capable of being used as a container" would be tautological in most, if not all, cases. Nouns for things which can contain something such as 'canister', 'envelope', 'box', 'drawer', 'vase' and so on already carry the connotation that they can contain something.

A 'fillable' canister, for instance, is different from an 'unfillable' one only in that it is not already full, sealed or damaged beyond use.

• If it is full its potential to be used as a container is is being utilised to its maximum extent.
• If it is under-used but sealed its potential is being used but someone has decided that the object it contains must be protected in some way.
• If it is empty but sealed it still capable of being used as a container, but only when the seal is broken (it might have been supplied as a sterile container for example).
• If it is empty and damaged beyond use it is an exception to the general class of canisters and so is described as "an unusable canister", "a flattened canister" or some other description that indicates that it cannot carry out the function implied by its designation as "a canister".

Unless someone can come up with a noun which identifies something which is not inherently capable of being used as a container but, under certain cicumstances can be used as a container there seems to be no need for a general word meaning "capable of being used as a container", so it probably does not exist.