Hard to asnwer this one directly, since my tent fits in my pack.

BUT: when I carried a fly rod that was taller than my pack, I used to lash it on the outside vertically. It stuck up a couple of inches above the pack--which made me really careful as I went under trees...but it worked.

you can also lash it on the bottome of the pack--but then you have to be REALLY careful everytime you set the pack down.

If you pack has ice axe loop (look on the bottom center of your pack) you can sometimes use that as the bottome point, and then run the poles up the outside of the back of your pack. Check out a site in ice axes to see what I mean.

Or you can get a smaller tent!
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