Who is interested in having their Bitcoin savings offline? I am thinking along the lines of paper wallets where the private key has never been exposed to the Internet.
It's actually pretty easy to generate a paper wallet offline so that the private key is never exposed to the Internet. You could use a paper wallet generator from a trusted website and run it offline or you could do what I did and run a copy of Vanitygen on an offline computer and either write down or print the private key onto a piece of paper. If you would prefer to keep your coins on something more durable then paper then you could alternatively choose to engrave the private key onto a piece of wood or metal:
There are also devices out there which can print paper wallets and hardware wallets like the Trezor which offer offline storage of bitcoins, as well as the ability to verify transactions and even sign transactions offline without the need to expose your private keys.
i find my usb doing a job good as a cold storage, so unless this thing is not much more expensive than a usb, i'll stick with my pen drive
in my case i don't need to do a offline transaction, because i have a good way to know if my pc is safe
in my case i don't need to do a offline transaction, because i have a good way to know if my pc is safe
Flash media might work well for a few years but exceptions aside, I wouldn't trust it for extended long term cold storage. The electrons can slowly leak over time. Most pen drives will lose some of their data after one or two decades without being powered up.