Filled with something
Tom took the garbage bag and tried to prepare himself for anything. He assumed the bag would be very heavy since it was almost bursting. When he lifted the bag, he was surprised by how light it was. He was confused and now wanted to open the bag.
Instead of opening the bag on the spot, Tom decided to take it back to his tent. He would be unnoticed there. It wasn’t good to get caught rummaging through trash bins. Besides, he didn’t want to attract attention.