Pouch which largely sealant. Easy to carry around with handles. You can store the charger & problem-free mice in the closed bag. The open bag is impractical, I just used it to put a train ticket (that is about the maximum size that can be put in). The downside is the softness of the cover which I think is sufficient for a relatively cautious transportation (I use almost every day), but probably not enough in case of fall, for example.
