That is something you need to create and dispose in prepareForReuse :)

class MyTableViewCell: UITableViewCell {
  let onReuseBag = DisposeBag()

  override func prepareForReuse() {
    onReuseBag.dispose()
  }
}

bnd_bag is automatically provided as an extension to NSObject and is disposed when object is deallocated.

@srdanrasic got it, thanks!