Review on Ultimate Comfort On-the-Go: Travel Pal Auto-Inflating Mini Lumbar Support with Lifetime Warranty by David Robinson

Expensive due to size and lack of a storage pouch or even velcro strap. I bought a replacement back brace that I accidentally left on the plane. The measurements were in the description but I must have overestimated myself. It's a lot smaller than I imagined. It worked well enough on the last trip so I'll probably keep it. It packs a little. Luckily I had a storage case from my lost one which I used. A long velcro would be an alternative to rolling it up.