These are the most travel-friendly e-readers - Good e-Reader
Waveshare 7.5inch E-Ink Display HAT for Raspberry Pi 800×480 Resolution with Embedded Controller Communicating via SPI Interface Supports Raspberry Pi Series Boards and Jetson Nano : Amazon.ca: Electronics
6 Inch E-ink Carta Display E-reader Kobo Clara Hd 1448 X 1072 300 Ppi With Frontlight N249 - Tablet Lcds & Panels - AliExpress