TANCUDER 20 PCS Mushroom Bags with Vents, Mushroom Grow Bags Autoclavable Mushroom Spawn Grow Bag Clear Breathable Mushroom Substrate Bag with 0.2 Micron Filter Patch for Mushroom Grain (19.5 x 50 cm)

10/10 no issues when pressure cooking, nice thick bags, work a treat.

tougher than I expected.

decent make sure they don't touch the border (you wrap them with filter inside not facing the walls), some melted badly

Will be buying these all the time. Great size. Thanks.

Absolute TRASH melted in pressure cooker at 12PSI after just 60 minutes.

These work, but like other reviewers noted, seem to to go soft when in the autoclave. I put these in the Instant Pot Pro which as a canning feature (normal instant pots don't go up to 15PSI which is the magic number for sterilisation). I sealed it easily with my Foodsaver Vacuum Sealer, although I'd hoped they'd it'd actually do the vacuum thing to make them smaller for storage, but nope - straight to seal.

My impulse sealer melts holes in theseHowever they do go through sterilisation just fine so I'll be reusing them. I'm simply having to be super careful with the impulse sealer: micropore tape folded over to top, a bunch of low temp poor seals, then folding it several times, and taping down the folds. I'm not confident it's very good at this still, but for 1/3rd the price of the competition I'll take itI don't really trust the air filter either so I put micropore tape over it too, no clue if that's neededEdit: I'm downgrading this from three to two stars now, I've had the bags tear two times in a row now which is extremely frustrating. I think I'm just going to have to start buying more expensive bags

These bags are fine if you're just getting into mushroom growing, the price is cheap so you don't feel bad messing up your work as you're learning.That being said, the quality of them isn't great, it's hard to describe but it's as if they barely make it out of the sterilisation process. As if they slightly melt or lose their flexibly properties, and then they re-solidify after cooling, but become creased, warped and easy to break.Additionally they are also poor for use in impulse sealers, so you're better off cable tying the top rather than impulse sealing. The filters are ok best I can tell.