In the denouement, when Hogan brings the box of bottled water to Klink so he can write the note, Hogan carries the box as if it were empty (which it almost certainly was). Given the size of the box, there would have been at least four bottles in the box (assuming the same type bottles were used here as those used to send the samples off to be analyzed). Assuming the bottles were two-liter bottles, since one liter of water weighs approximately one Kilogram (2.2 lbs.), each bottle would weigh at least two Kilograms (4.4 lbs.), giving a total water weight of 8 Kilograms, or 17.6 lbs. Adding in the weight of the glass bottles (4), the weight of the whole package would be at least 20 lbs., which Hogan could not carry in the manner he does. The way he carries it, it would almost certainly have fallen out of his grip - or Hogan would have crushed the box in his effort to hold the box under his arm. If the box contained the water, Hogan would have been carrying it by supporting it from underneath.