As laptops have gotten smaller, features have been stripped out and some capabilities have been diminished, so your super-slim PC may very well have tinny speakers, a too-small hard drive and limited ports.

Lenovo aims to correct that with its new ThinkPad Stack system, a series of boxy accessories that slot together and offer expanded capabilities for your laptop. These small boxes, each about the size of a portable hard drive, are designed to nestle on top of each other, allowing you to add just the features you need, while maintaining a small desktop footprint.

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The initial run of Stack devices include a Bluetooth speaker, a power bank for extra battery life, an access point for sharing your Wi-Fi signal and a 1TB external hard drive. An interlocking pin design passes both power and data through the Stack devices you have set up, so you won't end up with a massive tangle of extra cords.

Connecting via micro-USB 3.0 or Bluetooth, the Stack series can technically be used with any laptop, but the basic black design is clearly made to complement Lenovo's line of minimalist ThinkPad laptops. The devices are each about 5.5 inches by 3 inches (14 cm by 8 cm), and carrying all four available devices will only add a bit under 2 pounds (around 900g) to your travel bag.

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The Bluetooth speaker will be $89, the power bank will be $49, the wireless access point and 1TB HDD will be sold together for $199, and all the Stack accessories are coming to the US in April. Price and availability information outside the US is not yet available, but the US prices convert to around £60, £30 and £130 or AU$110, AU$60 and AU$245.