Is the Ridge duffle waterproof?

It is water-resistant, not waterproof. The waxed canvas sheds rain and splashes, but a soaked-through bag or a submerged one will let water in through the zipper.

How much can it hold?

The stated capacity is 36 to 55 liters, which covers clothing and personal items for a short trip of a few days. The end zip pocket is separate from the main compartment.

Does it come with a shoulder strap?

Yes. It has dual leather top handles and a removable adjustable shoulder strap that attaches at the D-ring on the side.

How do I care for the waxed canvas and leather?

Wipe the canvas with a damp cloth and air dry only. Condition the leather trim periodically, and avoid machine washing or tumble drying.

Can it work as a carry-on?

At the smaller end of its capacity it fits typical carry-on limits, but a fully packed 55-liter barrel duffle is likely too large for overhead bins on some airlines. Check your airline's size limits before packing it full.

Is it good for the gym?

Yes, though it is larger than most gym bags. The end pocket is useful for shoes, and the water-resistant canvas handles a wet towel or damp gear better than fabric or leather alone.