Great question — answering as the UphillTech team:
I think having it vertically using side compression straps or bungees on the rear of the bag effects movement the least (ie not getting caught on stuff). As Kate Gregory mentions the pads are really light and don't affect the balance of the bag too much so I wouldn't worry about that. foam pads like the one you have are also really tough! Unlike an inflatable it doesn't really matter if it gets a hole or tear. (source: blogs.dw.com ) image chosen mostly for dramatic clouds Another alternative is to chop your sleeping-mat up into panels that fit against the back of your bag and create hinges using gaffer tape. many people use this to replace existing back supports in bags so the pad will...
Full answer by aaaaargZombies: https://outdoors.stackexchange.com/a/9808 (CC BY-SA 3.0).
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