You may need to experiment with various cervical travel pillows or back support accessories to find what works best for you.
Memory foam pillows
Memory foam pillows work by cushioning the neck to provide support and comfort on long journeys. By cradling the neck, the pillow’s materials and design allows for support on all sides of the head, ensuring that the neck rests in place without being placed in an unnatural position
Lumbar support accessories
The lower portion of the spine, just above the buttocks, naturally curves inward toward the belly (the lordotic curve). Lumbar back support helps promote good posture by simply filling in the gap between the lumbar spine and the seat, supporting the natural inward curve of the lower back. An example would be a lumbar pillow.