From what 14 owners described in owner discussions between February 2020 and June 2026. Owners rarely say which UMAi bag size they used, so these are reports from owners aging smaller cuts (about 3 to 10 lb) in UMAi bags, the range this size is made for. Reports on whole subprimals are on the Ribeye/Striploin page.
Most of what owners report about smaller roasts is about loss. A 5 lb ribeye ended at about half its weight after 28 days and trimming, and a 7.75 lb cut lost about 55% over 80 days before trim.
Length matters more than with a whole loin. One owner judged 45 days too long for a 3 lb rib roast, and a 4 lb tri tip aged 40 days came out very dry; at the other end, the owner of a 5 lb ribeye tasted no difference at 28 days. A 10 lb ribeye taken past 50 days was a complete success for one owner.
Owners who want to try different ages from one purchase have halved a large cut into two bags, which is a practical use for the smaller size. Otherwise, owners who got poor results from small cuts often blame the cut rather than the bag.