I really like having PALS webbing on my packs. It really doesn't add that much weight (although the kind of pack that would have a lot of webbing is likely a heavier, more robustly built pack to begins with). I don't like a lot of crap MOLLE'd to the outside but I really like to have a pouch for a multi-too, a fixed blade knife (either a Mora or an ESEE Izula II, usually) and a Thyrm CellVault on the outside of my pack. This is really key to me; those are items I don't want to have to dig for when I need them. No matter the pack those things are always on the outside and always in the same general location. That's really convenient for the way I hike, camp and pack stuff.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman