Rack trunks are cool. They’re convenient to get into, they fit almost any rack, and they don’t increase the width of the bike — a nice feature for commuters using transit and storing their bikes in tight quarters. Plus, hard-shell trunks offer the advantage of being water-resistant/waterproof and many are lockable.
I’ve been playing around with Planet Bike’s “Escape Pod” and I really like it. It’s a simple hard-shell trunk with a clasp on each side, a padded internal bottom, and an internal cargo net. It comes with a built-in lock and two keys, and the PB logo on the back is reflective safety material. Installation was easy and took all of about 5 minutes. There are other, more sophisticated hard-shell trunks on the market (at double the price), but the Escape Pod is perfect for daily rides back-and-forth from the office or errands in the neighborhood. Overall, it’s a really nice product at a great price.