When sourcing bicycle travel cases, prioritize material durability and internal protection systems. For Hard Shell Cases, look for high-molecular-weight ABS or Polycarbonate which offers maximum impact resistance. For Soft Shell Cases, ensure the use of Ripstop Nylon (1200D or higher) with integrated internal mounting stands (aluminum or steel) to secure the frame. Key features should include crush-proof technology, reinforced wheel compartments, and 360-degree maneuverable wheels for ease of transport in airports.