It depends on how you define storage. If you are talking about weeks or months, even longer, then depending on the method or wallet that you use, you should be good.
On the long range, there is gold coins, most obviously.
In a midrange, stick with money bills.
For the adventure right now, go for Bitcoin. It's future is still uncharted territory.
I like taking risks when I am holding my money into bitcoins. I too agree that there are chances of it dropping in value, but the chances of gaining is also there, and definitely with more chances than dropping as per considering the current trend, there is so much opportunity for bitcoin to grow in value even more.