I had that once. 12x12x12 inches is actually 30.5x30.5x30.5 cm so it is possible that your shipping options and your parcel sizes are off so it won't calculate it. You need it to add up to and no more than 90 cm total, no matter what the dimensions. I usually just put 30x30x30 and 1.999 kg for all parcels so that I have wiggle room. There really isn't a lot of difference for the buyer unless the item is small and uder 500g. In that case you can use 999g as your weight when making a draft. Also, most things are parcels now, when shipping to the US so I rarely use padded envelopes, only if it will bring a parcel down below a weight bracket. CP does 0-500g 500g to 999g, 1kg to 1.499 kg and then 1.5 to 1.999 kg. I keep what I am selling within all I have said here and I rarely have issues. Hopefully this helps everyone out.
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