Portable breadboard prototyping trays! There are similar models out there, but they didn't quite have the features I was looking for. With these you can now:

• Accommodate any standard breadboard size (standard, half, and mini)
• Integrate the trays with your Gridfinity setup (standard size is 2x6, others are 2x3)
• Stack the trays when not in use
• Store a variety of components in the convenient tray compartments (scooped for easy picking)
• Store jumper wires with dedicated clips (or use the compartments for components if not using for jumper wires).

Hope you enjoy!