Heavy kayak drybags are out of the question for backpacking.
You can use light backpacking drybags in a kayak, but,
Double bag important items. I use one silnylon and one cuben. I do find the Lawson bags to be very thick and durable. I can't compare to the others though.
Be gentle getting them in and out of your hatches. Keep your hatches clean. Grit can collect and be abrasive.
Condensation can be a big problem when kayaking. If you open the bags for lunch on a warm wet sunny day, any air in the bag will condense while paddling on the cold water. I always keep industrial desiccant containers in my bags and rejuvenate them from time to time in the oven, if available. Make sure you squeeze out as much air as possible when you roll them up.