We've been using these 25 compartment boxes from Home Depot for years for FRC, FTC, Vex, and FLL. They're very durable, can be stacked, and fit in standard FRC totes. They have adjustable/removable partitions to fit longer parts. We like to glue in partitions for smaller part storage or the partitions will sometime lift up allowing parts to migrate between compartments. We haven't broken one yet, or had it pop open (if its properly closed), even with quite a bit of rough handling especially when they're loaded with heavy pneumatic fittings. We usually put them in FRC totes for moving, but stacking them on a travel luggage cart would also work pretty well. I like them because they are only $10 and readily available.
Home Depot website:
Stanley 25 Adjustable Deep Compartment Storage Organizer
Model # 014026R Internet # 100375899
Store SKU # 542047
$9.98/EA-Each Free Shipping