What are file containers?

Question

Encryption

There are many small files. Separately, they take a very long time to copy. And it's stressful. Drive 30GB into the archive every time and copy - it infuriates no less.
Found a solution.
I'm using truecrypt with a one letter password. I mount, worked there and closed it. The file is on the hard one. Copy quickly.
Purpose: you need a file container (it is possible without encryption)
What other ways do you know?
PS heard about vegacrypt, but these are the same eggs. And it’s somehow dumb to use completely brown software)

Answer 1

https://www.windowscentral.com/how-create-and-set-...

Answer 2

tar
gz-0