CC, we stuffed some of the sample stuff "pillows" of sand at Mountain gear into the dog pack to stimulate his food. If we're on the trail and he's got a full pack of food, it becomes much more difficult to put the bladders back in if the pack is full and on him; at least it appeared that way when we were at the store. Maybe we were looking at a different model? In my experience with Rocket, which granted has only been one year (but plenty of backpacking) the sloshing doesn't seem to affect him at all. No more than it does me (which is nil). He doesn't even seem to care he's got the pack on, full, half full, doesn't matter. It's just easier to reach the bottle down, fill it up, screw the lid on tight, put it in his pack and we're off. I also use the widemouth Nalgene bottles so that might make a difference.
~Elrond's Rocket of Rivendell, aka The RocketDog
06/15/11 hiker and runner extraordinaire
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