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Size 20L suitable for 20-35L backpack
Size 30-40L suitable for 40-45L backpack
Size 50-70L suitable for 50-70L backpack
Note: Please choose the size of the rain cover on the basis of the capacity of your package. 30L is just for 30L. So do the other rain covers.
Coated with ultrathin pu fabric features 3000mm waterproof
