Thought I would try dry aging a top sirloin. Bought a USDA choice grade sirloin of about 13 pounds at Costco. Aged it for 35 days and it is beyond the flavor, juiciness and tenderness I had expected. I have a prime sirloin I am now aging, along with a prime strip loin and prime rib eye. Costco here in Honolulu now has prime cuts and at a very reasonable price - especially the sirloin. I only had about a 20% weight loss after trimming even at 35 days.

Thanks for your report as some of us have kicked around the question of how well a top sirloin would benefit, but you are reporting success so that's good to hear! I must admit though I'm surprised that between aging and trimming it only lost 20%. I always weigh before trimming so as to get a handle on moisture loss.

I bought a choice grade 13.99 lb top sirloin on sale today at Kroger for $1.97 a pound. Yep, that's right, only $1.97 a pound. Amazing price. I'm going to try dry aging it in the roast bag if it'll fit.

Let me assure anyone in case they are wondering, a 14 pound Top Sirloin will not fit in a "roast" sized bag. It sort of looked like it might fit, so I tried. I split the roast sized bag open on the bottom and side seam trying to stuff that huge hunk of meat in it.

The solution was to cut off a 3 lb chunk (2 lb 14 oz actually). That left about 11 pounds of Top Sirloin, which fit very snugly in the roast sized bag. But it was a close call even at that. I'd suggest nothing larger than 9 or 10 pounds for the smaller roast sized bag. But it also depends on the shape of the meat to some degree. You might fit 11 pounds if the cut were a little longer and smaller in cross section than a Top Sirloin.

It's a nice chunk of meat. I'm going to age it for 28 days.