Osprey Ultralight Waterproof Dry Sack for Diving

Osprey Ultralight Waterproof Dry Sack – A Lightweight Roll-Top Bag for Keeping Gear Dry at the Surface

The Osprey Ultralight Waterproof Dry Sack is a 12-liter roll-top bag designed to keep clothes, electronics, and other surface gear dry while you dive, boat, or travel.

If you are a recreational diver looking for a simple, packable way to protect your dry clothes or phone on a dive boat, this is a straightforward option worth considering.

What it is and what it is not

This is a surface dry bag, not dive equipment. The Osprey Ultralight meets IPX5, which means it is rated to resist water jets but is not designed to be submerged.

That matters. You would not use this to protect something dragged underwater or strapped to a tank. Its job is keeping your belongings dry on a wet boat deck, in a kayak hatch, or in the rain.

If you need a bag that can go underwater, this is not it. If you need something that keeps your dry kit dry while you are in the water, it is well suited to that.

Closure and waterproofing

The bag uses a roll-top closure, the standard approach for dry bags. You roll the top down several times and clip or fold it over to create a seal. No zippers to fail, no gaskets to replace.

The fabric and seams are both waterproof-coated, so water does not sneak through the stitching. That combination of coated material and a rolled seal is what keeps splash and spray out reliably.

Size and shape

At 12 liters, this fits a change of clothes, a towel, a phone, and a wallet without much trouble. It is not large enough to double as a full dive bag, but that is not what it is for.

The rectangular shape is a practical choice. Round dry bags roll around and waste space in a gear bag or locker. A rectangular profile packs flat and sits neatly alongside other kit.

Dimensions are approximately 13.8 inches tall by 8.7 inches wide when packed, giving you a clear sense of how it will fit in a day bag or crate.

Weight and packability

The bag weighs 1.6 ounces. That is almost nothing. You can stuff it into a pocket of your gear bag and forget it is there until you need it.

Nylon construction keeps it light without sacrificing the coating that makes it water-resistant. It is the kind of thing you bring on every trip because it costs you nothing to carry.

Attachment and drying

A D-ring on the bag gives you two practical options. Clip it to a rail or line on the boat so it does not slide around on a rolling deck. Or hang it up after a trip so the bag itself can air out and dry.

It is a small detail, but on a crowded dive boat where gear tends to end up underfoot, being able to clip your dry bag somewhere out of the way is genuinely useful.

Who this suits and who it does not

This bag works well for the diver who wants a lightweight, packable solution for protecting dry clothes, a phone, a wallet, or a camera on a boat or beach day.

It is not the right choice if you need a large capacity for multiple divers' gear, a bag with pockets and organisation, or anything that needs to handle submersion. For those situations, a dedicated waterproof case or a larger dry bag would serve you better.

For what it is, the Osprey Ultralight is a simple, honest piece of kit. It does one job, weighs almost nothing, and takes up no space when you are not using it.