VEVOR 60" x 24" x 6", Hitch Cargo Carrier, 500 lbs Capacity Hitch Cargo Carrier with Cargo Net with Hook & Waterproof Cargo Bag, Folding Hitch Mount Cargo Carrier with Ratchet Straps, Fit for SUVs

Yes, the bag is indeed smaller than the frame — the inner dimensions of the bag without the frame are 340mm × 200mm × 530mm (13.39" × 7.87" × 20.87"), and it has a 36L capacity.