We've put a lot of money into our ski boots, so it's a no brainer to protect them with Thule's RoundTrip 45L Boot Backpack. The bag opens wide to fit a pair of boots with a backpanel that conveniently folds down to form a standing mat that keeps our socks cleaner and drier as we change in and out of our kit. The Roundtrip also features a soft-lined pocket to protect our sunglasses, goggles, or cell phone; a spacious side pocket to stash our gloves and accessories; and additional internal space and external lash loops to stash our helmet, too.