The Lenovo Thinkpad Stack is a frequent travellers dream accessory

The Lenovo Thinkpad stack is one of the less glamorous products to come out of CES, but it's one that we left most interested by. When the initial press release came through we were left with an initial impression that it would be a useful, if sizeable addition to your desk. In the end we left Las Vegas with it having been one of our favorite new products.

Firstly, what is it? Imagine how you'd stack up a home theater or home audio system and you've got an idea of how this thing looks. Then shrink it right down to the size of a smartphone but maybe three times thicker. That's about the size each part of the stack is.

If you opt for the full set up, right now you'll be getting a Bluetooth speaker, a USB 3.0 1TB hard drive, a wireless access point – provide an Ethernet connection and it turns into a wireless router – and a USB battery pack. All work together or individually. Items in the stack connect together through pins, and only requires one power source when stacked up. So, for example, you can plug the battery pack in at the bottom and it will charge this as well as powering and charging the bluetooth speaker and provide power to the USB hard drive and wireless access point.

Better yet, the same principle still applies if you stack up multiple items of the same type. If you have two battery packs, you can still charge them both using one power supply. All items work individually using either direct or USB power, or onboard battery power (whichever applies) and since they're so small they're absolutely perfect for the frequent traveller.

So while the Thinkpad Stack may lack a little glitz and glamor – though there's a certain amount of style produced by the classic Thinkpad look anyway – it's one of the best thing's we've seen out of CES. Because it's a genuinely useful and innovative idea. And we might just be picking up a couple when they go on sale in April. Prices come in at: