@mushkovits did you end up buying that cargo bag? Would you recommend it? Does it have enough space to fit 6 egg boxes?
The carrier purports: Massive 21 cubic feet (L52" x W39.5" x H17.5")
Delivery boxes from KRM (which are smaller than true 'egg boxes') are L19" x W11" x H13"
You're able to fit 8 KRM boxes inside.
3 boxes side by side (3 x 11") filling the width of the carrier (39.5").
2 rows deep (2 x 19") leaves 14" more for another box sideways.
Or you can fit 2 boxes turned the other way, (2 x 19") carrier (39.5)
Then you can fit 4 rows (4 x 11") into the length of the carrier(52")
That leaves 5" above the boxes for more stuff.