What's the difference between the Trtl Original and the Trtl Plus?

The Trtl Plus is heavier (around 9 oz vs. ~4.5 oz), uses a more rigid adjustable-height neck support, and costs roughly double. Specialist subreddit and expert reviewers we read consistently say the Plus offers better support for taller users and back sleepers, while the Original is lighter, easier to pack, and machine-washable, but can feel flimsy or claustrophobic for some.