...picked up 2x35 packs of 16.1 liter Crystal Geyser and it just went FUBAR...
I'm reasonably sure I did the math incorrectly or I'm not imagining this scenario the way it actually occurred, but using a weight of 2.19 pounds per liter of water means you attempted to carry about a ton and a quarter on a Surly Cross Check. If I'm wrong, and I'm assuming I am, I would appreciate being corrected. If I'm right then quite frankly I'm dumbfounded.