TREKOLOGY Ultralight Inflatable Camping Travel Pillow - ALUFT 2.0 Compressible, Compact, Comfortable, Ergonomic Inflating Pillows for Neck & Lumbar Support While Camp, Hiking, Backpacking

Grabbed this from Amazon. Worked well for me on my last hammock camping trip. Barely inflated and it was perfect. Trekology Ultralight Inflatable Camping Pillow. $20 bucks and cheaper than some of the other options. The valve is great for adjustment too. https://a.co/d/0QOpgN7

This is the one I have used. It’s not going to be as comfortable as a regular full size pillow but its conveniet in its size. It also fits well in a single hammock. amazon link