I have no idea what iwom is...
But I wouldn`t use a bag. It`s just one more thing to have to carry and I`m trying to minimalize. It`s gotten crazy how much stuff it takes anymore to kill a deer.
I have to carry the bibs and parka anyway, otherwise I get overheated and sweaty hiking in. So, for me, it's no different. I hike in wearing my regular weight clothes, climb into the tree/blind/brush and throw this on. Toasty.
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