TonGass 60-Pack Autoclavable Mushroom Grow Bags Bulk with Microporous Filter Patchs - Large 8"x5"x20" Extra Thick 80 Micron (=3 Mil)| Mushroom Cultivation Spawn Supply Myco Bag Bulk Substrate Bags | 60-Pack Large 8"x5"x20" Extra Thick 80 Micron (=3 Mil), Mushroom Cultivation Spawn Supply Myco Bag Bulk Substrate Bag

These mushroom bags work great but they will burst in the PC if proper precautions are not taken. First, they cannot come into contact with the bottom or sides of your pressure cooker (PC). The PC will get very hot and it will melt the plastic. I place metal canning rings under the canning rack and then drape cloth over the rim of the PC arranged so that the interior is completely lined with cloth. Then I load the bags and then fold the cloth over top of the bags to clear the rim of the PC once loaded. Second, you cannot have any air in your bags or they will pop. The air expands under pressure — a lot! — and the filter patch does not provide enough ventilation to allow excess air to escape. The bags will then pop, and you will probably hear it. There are a couple of ways to prevent this. One is to not seal the bags until after they are PCed. This does complicate sealing the bags because the PC will wrinkle and distort the plastic. It is also not foolproof because if the bags are rolled tightly closed as per common practice then they could burst anyway. The safest way to prevent air from bursting your bags is to just not have any. Push all the excess air out of the bag so they look like they are vacuum sealed (which btw is impossible with these bags because of the filter patch). . Once all the air is out of the bag you can seal them and PC or else PC first as per your preference. I personally like to seal the bags before pressure cooking because they seal better, and I can verify that the excess air is fully removed before they go into the PC. If the air is not removed then you will observe a noticeable pillow of air inside when you try to roll them up. I seal my bags as close to the top as possible so that if necessary I can open the seal, remove the excess air, and still have enough head room to reseal the bag. If you follow these precautions then you can avoid bursting your bags on the regular.

Used these bags for substrate sterilization in a pressure cooker and overall they performed well. No issues with bursting during the process—as long as you let the pressure cooker cool down properly before opening. If opened too soon, they can burst, so cooling time is important. The bags are clear and good quality, and they held up fine after sterilization. No noticeable deformation or issues once cooled. Sealing was a bit tricky, but that may be more related to the sealer than the bags themselves. After continuous use, the sealer got hotter and started slightly melting the plastic, so we had to let it cool down between seals. These are 3 mil bags with an 80 micron filter, and they seem to do the job well for general use. They do not come with inoculation ports. Included a photo showing early colonization using these bags. For the price ($39.99 CAD for 60), they offer good value overall.

Excellent, they worked very well for me!

Perfect for bulk substrate to bulk spawn to. Bags held well pre-sealed and pressure cooked, A few bags in and already impressed. Have fun folks! (please be safe if you do pressure cook pre-sealed-know what you're doing). Some bags had markings on them but few bags in perfect and I won't foul these guys for it, I'm buying more when I need them.

worked as intended, did not melt or burn inside the pressure cooker for 3.5 hours. I highly recommend if you;re growing mushrooms, sterilizing anything. Plus there were 66 bags in the package! Which is a bonus. highly recommend to mycologists enthusiasts, it's a solid bag. Comes with the white filter only. If you need to inject anything in it you need to puncture the bag and then tape it. Or you can buy the self healing sticker. Highly recommend it!