You’ve just spent a day hiking to the top of your local peak; you reached the summit, bathed in its 360-degree views, devoured a PB&J (or two) and began the knee-pounding trek back to the car when it starts to downpour. With hours left to walk, your extra layers are done for, and your camera is kaput.

In that situation, and many others, SealLine’s Blocker Dry Sacks fit the need. SealLine builds these roll-top, waterproof sacks with 70-denier polyurethane-coated nylon that’s both durable and lightweight. The Blocker Dry Sacks are available in a full range of sizes from 10 to 30 liters and will keep their contents dry even when the bag they sit inside can’t. That makes them a practical accessory for backpacking, naturally, but also for travel to cities too. The Blocker sacks double as gear organizers — they stuff and cinch into a rounded rectangular shape that maximizes space within a backpack, duffel, or roll-aboard — and are a handy item to have around even when rain isn’t in the forecast.

Right now they’re up to 48 percent off too, depending on the size you’re after.

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