>>1817200There are several mounting options. All-in-one kits (like Ortlieb), hooks, velcro. Velcro won't come undone, weak peel strength), but it's the annoying to adjust. Vinyl-coated gutter hooks are cheap, work well. Kits work well, but are expensive, and if you break parts you have to order from mfg. For the bottom attachment, if not using a kit, I recommend a bungee and hook. Simple, easy to work on/fix. The gutter hooks are easier to source, but you can get both from Jandd.
Extra features I suggest: top handle (like on a backpack; makes moving, adjusting bags much easier), exterior mesh pocket (temp storage of wrappers/trash, a place to dry out gloves/jacket/etc).
If you have specific questions, just post more in /bqg/ or a touring thread.
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