Durable water repellent can get you pretty far, but for downpours and wetter conditions, the Ultralight Raincover will keep you backpacking, trekking or hiking pack protected and dry. This size of raincover is perfect for 50-75L packs.
Features:
Fully waterproof 40D high-tenacity nylon ripstop
PFAS-free Durable Water Repellant (DWR) treatment
Taped seams for water protection
Drawcord for a flexible fit
Packs into its own carry case, roughly the size of a tennis ball