Watertight II is a packable rain shell Columbia still sells as style 1533891. The product page names Omni-Tech fully seam sealed fabric, a mesh lining, and a jacket that packs into its own hand pocket.
The same page prints 29.0 in / 73.7 cm center back, 100% nylon 2L, and Regular fit.
Shortlist reason: a named style number, a printed seam-seal claim, and a listed center-back length on columbia.com.