The recommended storage options:

Hang in the closet (unsquashed by clothing on either side).

Store in the large cloth bag that comes with it, on a shelf or wherever there is room. Again, not squashed in any way.

Under the bed is the other favorite place, not recommended for cat owners.

Unless you have a really enormous single-compartment pack, there won't be enough room to let the bag fluff fully. The cloth storage bag that came with my sleeping bag is about twice as large as my pack.

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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey