"There's a box for WEIGHT on the right side of the label copy that you provided that appears to show either "2 L 8 oz" or "218g"."
I read it as "218 g" (or 218 grams).
"...If the T-shirt and pack/sack came in a box (vs an envelope) with a packing list, it could not have weighed as little as 218grams (less than 1/2lb.)..."
It's possible. If the t-shirt was shipped in a medium sized "padded bag", both the bag and the t-shirt would weigh close to 218 grams. Of course whether that person received a t-shirt from "Brand 8000" is a different story...all we see is the P.O.D. and no t-shirt.
FYI it's unclear whether Joyful received something from "Brand 8000" in a cardboard box or a padded bag.