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Your scale will hardly notice the difference when you start using these
Internal pack organization, drying items, keeping things stink free
1 liter: snacks, wallet & keys2 liter: some snacks and drinks or extra layers4 liter: a layer and a meal or so worth of food8 liter: a puffy jacket & a sleeping bag or food for 2-3 days13 liter: all your clothes for a trip20 liter: a tent or any Sea to Summit sleeping bag35 liter: paddle gear, overnight camp equipment or bike gear