It could be heavy, but it’s far from guaranteed and a pretty big risk to take especially when you don’t know the weights on the rest of the packs in the box.
According to the e4 pack weights database, there have been non-holo packs at 20.8 and holo packs at 21
www.elitefourum.com/t/pack-weights-database-post-your-info-here/29044/1