Unicorn mushroom bags need to be sealed so that gasses move in and out only through the filter.
They also need to be tough enough to stand up to the agitation necessary to disperse spawn within a newly inoculated bag. We have seen all sorts of techniques that really challenge our bags.
Spawn bags also need to be tough so that you can breakup the spawn, when ready to use, without breaking up the bag.
To offer you more confidence in our bags, we present the following short video that proves Unicorn Bags can take, literally, a beating: