Yes, That's correct there is actually a cheep effective way to build a durable kayak with saran wrap..
This guy from Russia is a boss in the wilderness, He also constructs a dome structue with branches/saran wrap it's amazing yet quiet simple and durable. Check out his channel he has many useful knowledge In the field of modren bushcrafting. Guys let me see what awesome, cheep building/engineering bushcraft projects that inspire you and keep you going..