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The bottom carry handle of Gen2 containers (below) is important when mounting Rotopax to Sherpa. That is where the bolt holding the suction cups mounts. You can see the bolt peaking through the bottom handle here: Xterra Sherpa photo
1) Rotopax (flat) spout for instant water - this is the only setup I have used for years. $6 plastic spout lasts 6 months at most; don't use plastic angled piece