Use transparent plastic bags inside and keep dignity within the boat.
Collect and remove
Marine litter in the same day.
On longer tours this is hard to combine because you don't have much room left.
The Tarp is simply
a piece of low friction material that will allow your people to haul heavy loads across
This has proven to work really well.
The downside of the tarp is that the terrain will determine whether or not its effective. Dividing your collected trash into small bags will let you quickly replace the tarp in rocky terrain.