HKDK, never had any c2S dry sacks, which is all I've ever used in 12 yrs get my food wet either in my pack or when hung in torrential rains. My experiences are different. The only time I could see the ultra sil dry sacks, reg or Nano, susceptible to leakage under backpacking scenarios is when they are overly packed not allowing for the fold down top to be properly closed and clasped or when a hole has abraded through the fabric or the seam taped dry sacks have had the seam tape loosened. Do you see any of those issues in your analysis?