The Alpkit Hunka is considerably "slimmer" than the army issue bivvy bag.
I use a Hunka with a CCF mat and a lightweight sleeping bag in the summer and it's lovely and snug, I use a British army issue MVP bivvy bag with a full length Thermarest and a winter weight bag through the colder months and I've got plenty of room to move around.
If you don't fit too well in an army surplus bag then I think you'll really struggle with a Hunka.
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