The Arkel bag won out. Reviews of the Lone Peak were nearly nonexistent- although one I read said it had no waterproof capability at all. The Arkel is mostly waterproof although maybe not to the extent of the Ortlieb, but I like the "classic" look of the Arkel better Also, from all I've read the Arkel's attachment system is unparalleled (despite reports of possible rattling). The Arkel also includes a sturdy map case which is important to me because I rely heavily on paper maps when I tour. The Arkel is more money than I ideally wanted to spend but for once I didn't settle for the less expensive option only to go back later and buy the more expensive one.