This is a very clever design which, when expanded, enables you to work on a complicated project in a space-efficient physically stable platform. I have a raspberry pi, Arduino mega, esp8266, span tilt servo mechanism and a ton of breadboarded components all connected in a tidy compact workspace that I can carry easily in one hand. Yes it is held together by rubber bands but the design locks everything down and it seems very sturdy even “fully loaded” with gear. Very happy with my purchases - I bought two. Extremely versatile and useful.