The PiTop is a laptop that has a Pine64 (similar to a Raspberry Pi) inside it. The PiTop has a 11.6" screen, keyboard, touch pad, 1.2MP camera, Bluetooth 4.0, and more. The MicroSD card slot supports up to 256GB cards. This is a low-end laptop with 2GB RAM, 12GB of storage, and it only runs Linux, not Windows. But there are many free apps for Linux like OpenOffice. This laptop will do fine for word processing, spreadsheets, but may not do great at streaming video.
The 11.6" screen version weights only 2.3lbs (1.04kg).
This might be worth checking out. See full article here.
The main Pine64 site that sells the laptop.