Goodluck cracking an AES-256 7zip file with a long password 
They will die trying.
Edit:
Nevertheless, my point is that we don't really need any hardware wallet (or any expensive 3rd party wallet) when we can create our own inexpensive cold storage in password-protected .rar files burned in high quality DVDs from a formatted forever-offline computer.
Why go through all that trouble when you can secure it with something that is more secure and convenient and costs only 89?
I would also strongly recommend the Trezor. So cheap compared to what it's protecting.
It's not just about the encryption, but keeping it physically isolated (all the key-signing happens on the separate Trezor hardware).