Sending RPi with USB stick

You can send your RPi (model A, B, B+, 2, ... etc.) with small sized USB stick. It is allowed to send USB sticks similar to: 



Is it possible to send in more than one of these small usb drives with a RasPi ? i.e. up to 4 for a RP2 ? Having 2+ would be good for RAID.

Yes, it is possible, but it has to use less than 1 A power source.