Despite knowing nothing about which cryptocurrencies you're using, I'm going to recommend the following two HWs: Trezor Safe 3 or Safe 5
^{- Make sure to check "this list" before ordering any of the above HW models.}

It depends on the brand that's behind it... I might feel somewhat safe with Trezor devices, but I can't say the same for other brands.

If someone discovers a vulnerability in it, your stashes will be at risk!