Noodle Pi is described as "the smallest, lightest, most open handheld / wearable computer," a Raspberry Pi tightly packaged with a high-resolution multi-touch screen, battery and camera in a compact 3D-printed all-weather case. About the size of a large smartphone but much thicker and more versatile, the Noodle Pi has a bunch of accessories to go with it including a keyboard/touchpad dock and a "Noodlendo" clip to attach it to a classic game controller.
Noodle Pi uses the recently released Pimoroni HyperPixel 3.5" display. This is a high speed, high resolution (800×480 pixels at ~270 PPI) touchscreen display with 18-bit color (262,144 colors) and a 60 FPS frame rate.
Noodle Pi also integrates the Raspberry Pi Camera Module v2, for up to 8MP still photos, and 1080p30 / 720p60 / VGA90 video.
Noodle Pi is powered by an internal 500mAh battery. It can be charged via a regular micro-USB charging socket, and there's a red LED to provide a low battery warning.
You can buy it for $200, or as a bag of parts (without electrics) for $50.