{"product_id":"unicorn-3b-mushroom-substrate-fruiting-bag-large","title":"Unicorn 3B — Mushroom Substrate Fruiting Bag (Large) *high gas exchange*","description":"\u003cp\u003eThe Unicorn 3B is a large mushroom substrate fruiting bag built around the breathable B filter — the choice for growers who need maximum gas exchange during colonisation. The same trusted bag dimensions as the 14A, but with a 5 micron B filter that promotes faster, freer air exchange. Made in the USA since 1990 by Unicorn Bags LLC, the industry's most trusted name in mushroom cultivation bags.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFilter:\u003c\/strong\u003e 5 micron B filter — high gas exchange, promotes fresh air exchange for species sensitive to CO₂ build-up\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e Up to 5 lbs (~2.3kg) of substrate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 19\" × 8\" × 5\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 2.5 mil polypropylene — autoclave and pressure cooker safe at 121°C \/ 15 PSI\u003c\/li\u003e\n  \u003cli\u003eSide-gusseted, reinforced bottom seal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Growers Choose the 3B\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eThe B filter's 5 micron pore size delivers high gas exchange — ideal for species that need strong fresh air exchange and are sensitive to CO₂ build-up\u003c\/li\u003e\n  \u003cli\u003eSame trusted dimensions as the 14A in a slightly lighter 2.5 mil polypropylene construction\u003c\/li\u003e\n  \u003cli\u003e2.5 mil polypropylene handles autoclave and pressure cooker cycles without warping or seal failure\u003c\/li\u003e\n  \u003cli\u003eTrusted by hobbyists + commercial growers worldwide\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003ePrefer a more balanced gas exchange option? The \u003ca href=\"\/products\/unicorn-14a-mushroom-substrate-fruiting-bag-large\"\u003e14A\u003c\/a\u003e uses a 0.5 micron A filter for versatile use across the widest range of species. Ready for more volume? The \u003ca href=\"\/products\/unicorn-xls-a-mushroom-substrate-fruiting-bag-extra-large\"\u003eXLS-A\u003c\/a\u003e is built for high-volume production.\u003c\/p\u003e\n\n\u003cp\u003eNeed grain spawn bags instead? See our \u003ca href=\"\/collections\/mushroom-spawn-bags\"\u003espawn bag range\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eThe 3B is the bag of choice when high gas exchange is the priority. In stock \u0026amp; dispatched quickly from our UK warehouse.\u003c\/p\u003e","brand":"Unicorn Bags","offers":[{"title":"10 Bags","offer_id":64969301557597,"sku":"UNI-3B-10","price":15.0,"currency_code":"GBP","in_stock":true},{"title":"100 Bags","offer_id":64969301590365,"sku":"UNI-3B-100","price":80.0,"currency_code":"GBP","in_stock":true},{"title":"1000 (Full Box)","offer_id":64969301623133,"sku":"UNI-3B-1000","price":600.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1067\/7010\/4669\/files\/D3CF03DA-AE4C-4F99-925C-B260972DFB91.jpg?v=1781371918","url":"https:\/\/mycorevolution.co.uk\/products\/unicorn-3b-mushroom-substrate-fruiting-bag-large","provider":"Myco Revolution","version":"1.0","type":"link"}