Sea to Summit Big River Dry Bags

The Big River Dry Pack is fully waterproof. It features a triple-coated base and a non-wicking Hypalon roll-top closure, meaning it will keep your gear dry even if submerged or exposed to heavy rain.

While it includes an integrated shoulder harness and sternum strap for comfortable carrying, it is designed primarily as a rugged dry bag for travel and water-based activities. It lacks the internal frame and ventilation systems found in dedicated hiking packs, so it is best suited for shorter treks or gear transport rather than long-distance backpacking.

This bag is significantly tougher than standard dry bags. It is constructed from 420D ripstop nylon, which offers high resistance to abrasions and punctures, making it ideal for rough environments where your gear might scrape against rocks or boat decks.

Yes, for a reliable seal, you should fold the Hypalon top down at least three times before buckling the sides. This creates a secure, watertight barrier that prevents moisture from wicking into the main compartment.

The 50L version is generally sufficient for a weekend of gear, while the 75L is better if you are packing bulky items like sleeping bags or winter clothing. Consider the 75L if you need extra room for shared equipment or extended travel.