{"product_id":"unicorn-4t-grain-spawn-bag","title":"Unicorn 4T — Mushroom Grain Spawn Bag (Small)","description":"\u003cp\u003eThe Unicorn 4T is the standard grain spawn bag for batches up to 1kg — compact, reliable, and the bag most UK growers reach for first. Whether you're running rye, oat grain or wheat berries, it handles autoclave and pressure cooker cycles cleanly with no warping or seal failure. 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 0.2 micron T filter — tight filtration for grain spawn, minimises contamination risk during colonisation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCapacity:\u003c\/strong\u003e 400g – 1kg of grain\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 4\" × 3\" × 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 4T\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eThe 0.2 micron T filter is the tightest in the Unicorn spawn range — ideal when you want to minimise contamination pressure on smaller batches\u003c\/li\u003e\n  \u003cli\u003eCompact footprint means you can fit more bags per autoclave run\u003c\/li\u003e\n  \u003cli\u003ePerfect for hobbyists, small lab setups, and anyone working in the 1kg grain range\u003c\/li\u003e\n  \u003cli\u003eThe same bag we've been running our own grain spawn in since 2021\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eReady to scale up? The \u003ca href=\"\/products\/unicorn-10t-grain-spawn-bag\"\u003e10T\u003c\/a\u003e holds up to 1.8kg, the \u003ca href=\"\/products\/unicorn-3t-mushroom-grain-spawn-bag-large\"\u003e3T\u003c\/a\u003e up to 3kg, and the \u003ca href=\"\/products\/unicorn-xlst-mushroom-grain-spawn-bag-extra-large\"\u003eXLST\u003c\/a\u003e up to 6.8kg — more grain per run, same trusted 0.2 micron T filter.\u003c\/p\u003e\n\n\u003cp\u003eNeed substrate bags instead? See our \u003ca href=\"\/collections\/mushroom-fruiting-bags\"\u003efruiting bag range\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eIn stock at our Glasgow warehouse. Dispatched same or next day.\u003c\/p\u003e","brand":"Unicorn Bags","offers":[{"title":"10 Bags","offer_id":64888385962333,"sku":"UB-4T-10","price":15.0,"currency_code":"GBP","in_stock":true},{"title":"100 Bags","offer_id":64888386060637,"sku":"UB-4T-100","price":72.0,"currency_code":"GBP","in_stock":true},{"title":"1000 (Full Box)","offer_id":64948558856541,"sku":"UB-4T-1000","price":600.0,"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-4t-grain-spawn-bag","provider":"Myco Revolution","version":"1.0","type":"link"}