Is the Voyager 40L fully waterproof or just water-resistant?

It carries an IPX6 waterproof rating, which means it withstands powerful water jets. That covers rain and boat spray, but it is not rated for full submersion.

How does 40L compare with a carry-on bag?

40L is close to a large carry-on and fits a weekend of clothes or a day of hunting and boating gear. It is bigger than a daypack but smaller than expedition duffels.

Does it have a laptop sleeve or separate pockets?

No. It has one spacious main compartment, so bring packing cubes or stuff sacks if you want organization.

Can I carry it as a backpack?

No. It is designed for shoulder or hand carry, so plan for that on long walks to camp or the dock.

What is the 1680D fabric good for?

1680D is a dense, heavy weave that resists abrasion and tears better than the 600D nylon common on travel duffels. It adds durability at the cost of some weight and stiffness.