It's not every day that we come across a device which is simultaneously cheap ( by cheap I mean affordable), extremely functional and doesn't weigh a ton.
It's a known fact that a photographers bag normally weighs around 15 kilograms (and that's light by my standards). Not to mention the amount of cables,  adapters, card readers and so on.

Let me introduce you to Kingston's Mobilelite Wireless G2.

I know that on the market there is  wide offering  of devices that  possess similar functionalities. All major brands  sell wireless hard drives that will sync  with your iOS, Android  and even Windows Phone devices. Personally I never did much photo editing on laptops, the only use I had for them was to empty memory cards or shooting tethered while outdoors. This nifty little device does all that and  it still has a few tricks up its sleeve. Through a wireless connection you can transfer photos from your devices to  an  available SD card reader or to  a USB  storage media, be it a pen  drive  or a regular external HDD.

Having  connectivity in mind the manufacturer included an ethernet port so that while connected to the device you can still access the Internet while uploading the files from your camera.  It has  a micro USB port for charging its battery or to connect  it to the computer and use it as an SD card reader.  Also,  the internal battery  that powers it can also be used to charge a tablet  or smartphone (I charged my iPhone twice on a single charge of its battery).   All this  packed  into a   device that only weighs 171 g.  It also  can  stream media  to several devices  since it's able to read a good  variety of file formats.  Although  it can store any other formats.  

At the end of this post I  placed  at PDF with its full specs.

Last but not least, it's price;  I got it for around €40, a bargain.

For a  complete list of features click here .