Used to protect seedlings carried in the two storage pouches from heat gain and moisture loss while the planter is on the hill. Trees can either be moved in bundles from the SilviCool III Sac to the draw pouch or the whole Sac of trees can be inserted into the draw pouch and the Sac opened and the top cuffed back to allow easy access to the seedlings. Draw string threaded through a white rip stop nylon collar. Simple and easy to use.