Originally had the Universal. I'm short (5'4"). Had trouble getting a tight seal a both ends at the same time. If I had the foot end tightly sealed body movement would cause the head end to leak out the trapped warm air. Mac traded me the 2/3uq for the Universal. No problems with sealing up the uq. I use the IX as my warm summer uq with a synthetic ~60*F rated tq. With venting mod on the uq it's a relatively lightweight (sub 20oz total), highly water resistant kit that is comfortable from +80*F to lower 50*F nights.
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