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Waterproof Shoulder Bag: Can a Dry Bag Be a Crossbody?

Using a roll-top dry bag with a shoulder strap as an everyday waterproof crossbody — pros, cons and what to check.

By the Rihla team · · 2 min read

Rihla 5L black waterproof bag opposite side with shoulder sling

A waterproof shoulder bag is simply a roll-top dry bag with a strap. That sounds basic, but it solves a real problem: the places where you most need things to stay dry — beaches, boats, rainy walks, a scooter ride — are also the places where you don't want to be holding a bag in your hand.

Where a waterproof shoulder bag shines

  • The beach: phone, wallet and keys stay dry and sand-free, and the bag stays on you when you swim to the shore or walk the water's edge.
  • Boat days: wear it across your body so it doesn't slide around the deck.
  • Rainy city days: a waterproof crossbody keeps your phone dry without a rain cover.
  • Scooters and motorcycles: carry it on the bike, then sling it on when you park — see how to secure a dry bag on a motorcycle.
  • Festivals and trips: one bag for everything that must not get wet.

What to look for in a waterproof shoulder bag

  • A detachable, adjustable strap. Detachable means you can stow it or move the bag to a rack; adjustable means it fits across your body, not just over one shoulder.
  • Dual buckles or quick-release clips. Easier than threading a strap through a D-ring with wet hands.
  • Strong anchor points. The strap is only as good as the D-rings and stitching or welds holding it.
  • The right size. A 5L is a true crossbody; a 15L sits more like a sling bag and is better for hauling gear short distances.
  • A roll-top closure. It's what makes the bag waterproof — learn the roll.

The honest trade-offs

  • Opening takes a few seconds. A roll-top isn't a zip — you unclip and unroll. For things you reach for constantly, keep them in a smaller pouch within reach.
  • It's cylindrical. It carries differently from a flat crossbody; a small bag sits fine, a big one can swing.
  • Weight sits on one side. Don't overpack a bag you plan to wear all day.

The Rihla 5L and 15L as shoulder bags

Both Rihla bags come with a detachable shoulder sling with dual buckles. The 5L is the everyday crossbody; the 15L is the bigger sling for gear-heavy days. Not sure which? Our size guide helps you choose.

Frequently asked questions

Is a dry bag a good waterproof shoulder bag?

Yes, if it has a detachable adjustable strap with solid anchor points. A small roll-top bag worn crossbody is a dependable waterproof option for the beach, boats and wet weather.

What size is best for a waterproof crossbody?

A 5L is a true crossbody for phone, wallet and keys. A 10–15L bag works as a sling for clothes and gear but sits larger on the body.

Can I use the shoulder strap on a motorcycle?

The strap is for carrying the bag when you're off the bike. On the bike, secure the bag with dedicated straps and tuck the sling away so it can't hang near the wheels.

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