The Hackpack v4 is an open-source hardware badge designed by Twilio, featuring a joystick, touchscreen, buttons, and Linux on a Raspberry Pi Zero W. The badge was released under the Solderpad 2.0 license and is available for download with assembly instructions and board files. To use the badge, users need to find a Raspberry Pi Zero W and follow advanced assembly instructions or pre-exported gerbers. The Hackpack v4 can be used as a handheld gaming device or modified to create new projects, with some games pre-installed on the firmware. Twilio encourages users to release their modifications under a permissive license, hoping to incorporate them into future designs.