If you’re looking for a tandem kayak for recreational use – Aquaglide Chelan 155 Inflatable Kayak is a good option. It can carry up to 600 pounds, is collapsible into a backpack and is durable enough for light touring or expeditions – meaning it’s great for lakes/rivers AND mild whitewater or light surf.
Even though it’s inflatable, I’ve always felt very safe when kayaking for 2+ hours in this.
https://www.rei.com/product/18933…able-kayak