Gymgit 30Pcs Mushroom Grow Bags with 0.2 Micron Filter Patch, 6 Mil Polypropylene, Large Size 8" X 5" X 20" for Mushrooms and Bamboo Fungus Ganoderma Mushroom, Substrates Or Grains

This bag held up well in the pressure cooker (Instant Pot), they are an ideal size but can struggle to fit in the Instant Pot if you fill it too much. They lack an injection port which is the only down side.

Despite what some reviews say, these bags didn't melt in my pressure cooker. I made sure they were lifted off the bottom and that my cooker didn't run dry and they worked a treat. Totally able to use them for fruiting blocks.

These were a good size and the filters seem ok but a couple of them seemed to lose their shape after pressure cooking? Not sure if it was something I did wrong or the bags not coping well with the pressure?

These are great. Quality made and solid. thickness is standard- these are easy to use/seal. (If you don't have a heat sealer, just tape shut with micropore tape. If you don't have that, then just some clear box tape (like moving box tape) They are great at keeping moisture in without being too wet, and the filter patch is perfect. You can slowly push air out of it once your substrate is inoculated.

I believe I'm on my third set. These bags seem to hold up.

These bags are great. If you’re into mycology, these bags are for you. They have high performance capabilities that allow them to not melt while being pressure cooked. These bags never rip or tear. They are clean and deliver on time! Thank you!!!