Patagonia Black Hole Backpack Sizes and Uses Quick Answer Use liter labels as starting points. The largest rigid item, packing geometry and loaded route determine the useful Black Hole size. Explore the Patagonia backpacks collection.As an Amazon Associate, we may earn from qualifying purchases.Check current Patagonia backpacks on AmazonPatagonia Backpack and Duffel ExamplesStart With the Main Carrying JobThe route gives start with the main...