{"product_id":"unicorn-4a-mushroom-substrate-fruiting-bag-small","title":"Unicorn 4A — Mushroom Substrate Fruiting Bag (Small)","description":"\u003cp\u003eThe Unicorn 4A is the most compact mushroom substrate fruiting bag in the range — the easy starting point for hobby growers, tight spaces and trialling new species without committing to a full-size block. Despite its size it's built to the same professional standard as the rest of the line, with a 0.5 micron A filter for clean, balanced gas 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 0.5 micron A filter — balanced gas exchange, maintains moisture retention during colonisation without over-drying your block\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e Up to 1kg of substrate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 4\" x 3\" x 18\"\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 3.0 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 4A\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eThe smallest, lowest-cost way into Unicorn fruiting bags — ideal for hobbyists, testing and limited grow space\u003c\/li\u003e\n  \u003cli\u003eThe 0.5 micron A filter gives consistent gas exchange without the moisture loss that wider filters can cause\u003c\/li\u003e\n  \u003cli\u003e3.0 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\u003eReady to scale up? We also stock the \u003ca href=\"\/products\/unicorn-10a-mushroom-substrate-fruiting-bag-medium\"\u003e10A\u003c\/a\u003e and the bestselling \u003ca href=\"\/products\/unicorn-14a-mushroom-substrate-fruiting-bag-large\"\u003e14A\u003c\/a\u003e for larger fruiting blocks, plus the \u003ca href=\"\/products\/unicorn-xls-a-mushroom-substrate-fruiting-bag-extra-large\"\u003eXLS-A\u003c\/a\u003e for high-volume production. Looking for grain spawn bags? We stock Unicorn spawn bags too — browse our full range.\u003c\/p\u003e\n\n\u003cp\u003eThe 4A is where many growers start with mushroom substrate fruiting bags. In stock \u0026amp; dispatched quickly from our UK warehouse.\u003c\/p\u003e","brand":"Unicorn Bags","offers":[{"title":"10 Bags","offer_id":64949106540893,"sku":"UNI-4A-10","price":13.5,"currency_code":"GBP","in_stock":true},{"title":"100 Bags","offer_id":64949106573661,"sku":"UNI-4A-100","price":65.0,"currency_code":"GBP","in_stock":true},{"title":"1000 (Full Box)","offer_id":64949106606429,"sku":"UNI-4A-1000","price":550.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1067\/7010\/4669\/files\/productpicssoonunicorn-nontrans.png?v=1781127757","url":"https:\/\/mycorevolution.co.uk\/products\/unicorn-4a-mushroom-substrate-fruiting-bag-small","provider":"Myco Revolution","version":"1.0","type":"link"}