You can decipher backpack volume in either liters (L) or cubic inches (cu), depending on the manufacturer. For day trips, you need a bag capacity of about 15 L to 30 L (roughly 1,000 cubic inches to 2,000 cu). Multi-day trips, winter camping, and specialized expeditions, like photography shoots, ski touring, hunting, or fishing, demand roomier packs. The largest packs range from about 50 L to 80 L (approximately 3,000 to 5,000 cu).
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