The BBO is designed specifically to fit the WBBB. Fits snug and you can still use the side pull outs / shelf.
KJ
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I am going to add a Thermarest Ridge pad in between my double layer BB and more layers on top of my TQ. Maybe my old 30* sleeping bag on top. I have to get my hands on some wool blankets too to put over my hammock and give that a try too.