As the middle-sized bag in Giant Loops lineup of waterproof dry bags, the Tillamook delivers just the right amount of storage space (38 liters) of completely waterproof / weatherproof storage. That size makes the Tillamook one of the best bags for large and small displacement bikes, so you can use it on anything from a WR250R up to an R1200GS. The Tillamook also works with or without a rack supporting it. If you already have a rear rack, pannier rack, or even saddlebags—hard or soft—strap the Tillamook right on top of them.
If you don’t have a rack, use a couple of the several lashing and attachment points the bag has to strap it down however you want. The double-ended, roll-top closures make packing easy, but they also mean you’ll have easy access to your gear regardless of how you orient the bag on your bike. Add in the excellent build quality along with all the lashing / attachment points Giant Loop puts on the bag and it becomes one of the most versatile and easy to use piece of motorcycle luggage out there.