Giant Loop Tillamook Dry Bag

Adventure travel quickly exposes luggage weaknesses. A system that looks perfectly adequate in the garage can become frustrating after several days of loading, unloading, rain, highway speeds, and repeated stops. For our journey to the 2026 Red Bull Erzbergrodeo, we wanted additional waterproof storage that could be mounted securely on our BMW R 1300 GS, removed quickly at the end of the day, and trusted when the weather turned against us.

The Giant Loop Tillamook Dry Bag filled that role: a 48-liter, expedition-sized roll-top bag designed specifically for motorcycle- and vehicle-based adventure travel.

After using it throughout the trip, what stood out wasn’t a complicated technical feature, but how effectively Giant Loop combined substantial capacity, genuine waterproofing, and an unusually practical mounting system into one straightforward piece of luggage.

A Simple Approach to Secure Mounting

One of the Tillamook’s strongest qualities became apparent before we had even started riding: installation is extremely simple.

The bag incorporates four anchoring straps positioned around its corners, each using a quick-release buckle. The concept is particularly effective because the anchor sections can be separated from the bag itself. We simply selected four suitable attachment points on the BMW R 1300 GS, secured the straps to the motorcycle, and then clipped the Tillamook into position.

Once all four buckles are connected, tightening the webbing draws the bag securely against the bike. No elaborate luggage frame to assemble, and no need to repeatedly thread straps through the motorcycle every time the bag is fitted.

The real advantage of this arrangement becomes apparent at the end of a riding day.

Instead of undoing the entire mounting system, you can release all four buckles and lift the Tillamook away while the anchor straps remain attached to the motorcycle. When it is time to leave again, the bag goes back into position, four buckles click into place, the straps are tensioned, and the bike is ready.

For a touring rider repeatedly moving between the motorcycle and hotels, campsites, or other accommodation, that small design decision makes a significant difference. Luggage that is easy to remove once is useful; luggage that remains easy to remove after doing it every day of a trip is considerably more valuable.

48 Liters in a Versatile Format

The Tillamook offers a maximum capacity of 48 liters, or 2,930 cubic inches, putting it firmly into substantial travel-luggage territory. Its usable volume can also be reduced to approximately 30 liters, allowing the bag to adapt to changing loads rather than functioning only when filled.

Fully equipped, the bag weighs 3 lb. 10 oz. (1.6 kg).

For our BMW R 1300 GS, we found it particularly well suited to being positioned across the passenger seat, creating a large and readily removable storage area without interfering with the primary motorcycle luggage.

That makes the Tillamook particularly interesting as an additional equipment bag. It can accommodate clothing, camping equipment, footwear, or the numerous items that inevitably accumulate during a multi-day adventure ride, while keeping them consolidated in one large waterproof compartment.

Its elongated format also lends itself naturally to mounting transversely across an adventure motorcycle.

Built to Keep Water Out

Of course, a dry bag ultimately succeeds or fails on one fundamental question: does the equipment inside stay dry?

During our journey to Erzbergrodeo, the Tillamook spent days exposed to rain. The result was exactly what we wanted: the contents remained completely dry, without a drop of water reaching the interior.

That performance comes from more than simply using a water-resistant outer material.

Giant Loop constructs the Tillamook from its rugged Bomb Shell™ coated fabric, with the body assembled using 100 percent waterproof radio-frequency welded seams. Instead of depending on conventional stitched seams that require additional sealing, RF welding joins the material to create a continuous waterproof structure.

Both ends are then sealed with roll-top closures. The system works by rolling the opening over several times before fastening it, creating the mechanical barrier against water commonly used in expedition dry bags.

It is a simple solution, but one that remains highly effective in the kind of prolonged wet conditions adventure motorcycles regularly encounter.

Access From Either End

Giant Loop has also addressed a traditional inconvenience of large cylindrical dry bags.

The Tillamook can be opened from both ends.

With many conventional dry bags, retrieving an item buried at the opposite end can mean removing half of the luggage first. The Tillamook’s dual-ended design means you can approach equipment from whichever side is more convenient.

This becomes especially relevant when the bag is mounted across a motorcycle and secured in place. Rather than designing the bag around the assumption that it will always be removed before being opened, Giant Loop has made access part of the mounting concept.

An integrated air-purge valve adds another useful packing feature. Once the bag is loaded, excess trapped air can be pushed out before final compression, allowing the Tillamook to take up less space and creating a more compact load.

From Motorcycle Luggage to Backpack

Another clever detail reveals itself once you remove the Tillamook from the motorcycle.

Detachable carrying straps let you configure the bag as a backpack.

At the end of a day’s ride, carrying a large 48-liter bag from the motorcycle to a hotel room, tent, or lodge is much easier when you can put it on your back rather than carry it awkwardly in your arms.

Combined with the quick-release mounting system, this creates a particularly logical workflow: arrive, release four buckles, remove the Tillamook, attach or use the carrying straps, and take your equipment with you.

The motorcycle’s anchor points remain ready for the next departure.

Designed Around Real Adventure Travel

Many waterproof bags are on the market, and at first glance their basic function can seem similar. What differentiates the Tillamook is the attention Giant Loop has given to how the bag interacts with the motorcycle throughout an actual trip.

The hardware uses heavy-duty side-release buckles and nylon webbing, while reflective detailing adds visibility. The bag can be used as a standalone piece of luggage or integrated with Giant Loop’s Coyote and Great Basin Saddlebags, as well as the company’s pannier systems.

This modularity is especially well-suited to adventure motorcycles, where luggage needs can change dramatically from one trip to another.

For a short ride, the Tillamook can serve as substantial standalone storage. On a longer expedition, it can become an additional waterproof bag for equipment that doesn’t fit into the main panniers.

A Particularly Effective Adventure Companion

Our trip to the Red Bull Erzbergrodeo provided exactly the kind of environment in which motorcycle luggage needs to prove itself: repeated loading and unloading, long riding days, and sustained exposure to bad weather.

The Tillamook proved to be an exceptionally practical solution.

Its 48-liter capacity provides meaningful additional storage, while the Bomb Shell construction, welded seams, and roll-top closures delivered the waterproof performance we expected from a genuine dry bag. But the mounting system made the strongest impression during everyday use.

Four buckles are enough to separate the bag from the motorcycle, while the attachment straps remain exactly where they need to be for the next morning. It is an uncomplicated idea executed extremely well.

Add the dual-ended access, compression valve, and backpack capability, and you get a piece of luggage that feels purpose-built for riders who actually travel with their motorcycles rather than simply carry equipment on them.

For adventure riders looking for a large waterproof bag to mount across the passenger seat or integrate with an existing luggage system, the Giant Loop Tillamook Dry Bag is easy to recommend. It combines the ruggedness expected of expedition equipment with something equally important on a long journey: simplicity.