There are two landfills in Vermilion County, both owned and operated by Republic Waste
There are other explanations for why he got rid of the duffel bag that don't involve it being used to dispose of her body. Michelle saw him take it out on Monday. That would be awfully, awfully risky to still have her remains in the apartment after Michelle was home and for nearly 24 hours. At some point, the remains would begin to give off the odor of decomposition that would be hard to mask. I think it is more likely he dismembered her in the tub, placed parts in multiple white garbage bags, then placed those in his dumpster, or took them to another dumpster in a different location before Michelle got home. He probably wanted to keep the duffel bag. It was ~$70 and very useful -he was almost certainly going to do this again at some point. However, once he found out the knew the make and model of his car, he knew they would be coming to talk to him. So he had to get rid of it. It would have her DNA and possibly blood on the inside of it -from the initial kidnapping, or from carrying out her remains, or both. Thus, Michelle sees him walk out with it on Monday, before investigators show up.......