Unicorn XLSA — Mushroom Substrate Fruiting Bag (Extra Large)

The Unicorn XLS-A is the biggest mushroom substrate fruiting bag in the range — and when you need serious volume & reliability, nothing else comes close. At up to 6.8kg of substrate per bag, this is what micro-farms and commercial producers reach for: extra-large fruiting blocks, in-bag fruiting, reishi antlers to high-yielding oysters & lion's mane. Made in the USA since 1990 by Unicorn Bags LLC, the industry's most trusted name in mushroom cultivation bags.

Specifications

• Filter: 0.5 micron A filter — controlled gas exchange scaled for large substrate mass, maintains moisture balance during colonisation
• Capacity: Up to 6.8kg of substrate (roughly double the standard 14A)
• Size: 24" x 10" x 5"
• Material: 3.0 mil polypropylene — autoclave and pressure cooker safe at 121°C / 15 PSI
• Side-gusseted, reinforced bottom seal — essential at this size

Why Growers Choose the XLS-A

• Double the substrate per bag versus the 14A — fewer autoclave runs, lower cost per block, more output per cycle
• The go-to bag for commercial operations
• Handles full autoclave cycles at this volume without seal failure or warping
• Trusted by hobbyists + commercial growers worldwide

Need smaller bags? We also stock the compact 4A and 10A, plus the bestselling 14A for standard fruiting block production.

Need grain spawn bags instead? See our spawn bag range.

The XLS-A is the bag growers move to when they're ready to scale their mushroom substrate fruiting. In stock & dispatched quickly from our UK warehouse.