If you state "no" on the question of adding oats and substrate, you are stating you only want the monotubs. This is a pack of two 64 quart monotubs and the optional pasteurized coco coir substrate and sterilized whole oats spawn grain. The added 24lbs of substrate and 8lbs whole oats will be for every 2 pack of monotubs. One has to either inject spores or culture into the inoculation port of the spawn bag (or put an agar wedge into the bag) and wait for colonization. Once full colonization has occurred in your spawn bag, mix the spawn with the coco coir substrate on the bottom of the monotub.Be sure to cover all exposed grains with your substrate, to avoid contamination of the weakened mycelium on the grains. This is a set and forget setup.
Once you spawn to your monotub, the humidity is already dialed in and fruiting will occur. No need to put any of your substrate or spawn in the dark (just out of direct sunlight, as indirect is good). After one flush, it is then ok to mist with water, to induce evaporation and an additional flush.
One can stack multiple monotubs on top of each other, to conserve space in your growing room. Comes with lids for the top of monotub. This item is made of monotub and whole oats, coco coir.