I don't use a bag and have never had a problem.
Everyone as they like :-)

Hello, for the Scandisk Extreme Portable (2000GB) I bought the "Hama Festplattentasche E.V.A." here.
Hama Hard Drive Case E.V.A.
It's very suitable, it's light, the size is ideal and it has a hard shell for protection. And the cables still fit in it. I'm very happy with it. Have fun, J.D.