Right before Bruce Wayne attempts to leave the pit he packs up something in a towel and wraps it around his body.
Does anyone see what he packs?
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Bruce carries a bundle with him during the first trip. Although it is not shown what is it that he carries, nor is it mentioned in the Script.
This time Bruce does not carry anything, he simply walks determined to the ropeway and starts climbing.
INT. CAVE PRISON - MORNING Wayne puts some scraps of bread into a rough coat which he folds into a makeshift shoulder pack. PRISONER Supplies for your journey? Prisoners nearby laugh.
From the picture one can assume that the folded brown packets are food items and the other is a water container. So basically, he carried sustenance with him - food and water.
According to this copy of the script (p. 127):
Wayne puts some scraps of bread into a rough coat which he folds into a makeshift shoulder pack.