I would bring my iPad with the Folio case to accompany my MBP. The MK might be higher, but I'd rather have less weight. My 16 inch is already pushing 4.3 LBS!
You would be saving about 300 grams or 11 oz with the Folio variant. If the MacBook alone is 1800 grams, then it’s going to be difficult to feel the lighter bag in a blind A/B test. But sure, the Folio is slighly lighter.