From
£20.00
Unicorn XLSA — Mushroom Substrate Fruiting Bag (Extra Large)
When you need serious volume, nothing else in the Unicorn range comes close. 4.5 to 6kg+ per bag — the go-to for micro-farms and commercial operations. Made in the USA since 1990.
Pack size
✓ Based in the UK • in stock, ready to post
✓ Free Royal Mail Tracked delivery
✓ Made in USA by Unicorn Bags LLC since 1990
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.
Filter: 0.5 micron A — controlled gas exchange scaled for large substrate mass, maintains moisture balance during colonisation
Capacity: 4.5kg to 6kg+ of substrate (roughly double the standard 14A)
Size: 24" × 10" × 5"
Material: 3.0 mil polypropylene — autoclave and pressure cooker safe at 121°C / 15 PSI
Construction: Side-gusseted, reinforced bottom seal — essential at this size
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Find your bag
Which bag is right for you?
| Unicorn 4T | Unicorn 10T | Unicorn 14A | Unicorn XLSA | |
|---|---|---|---|---|
| Type | Grain spawn | Grain spawn | Substrate | Substrate |
| Capacity | Up to 1kg (2.2 lbs) | Up to 1.8kg (4 lbs) | Up to 3kg (6.6 lbs) | Up to 6.8kg (15 lbs) |
| Filter | T - 0.2 micron | T - 0.2 micron | A - 0.5 micron | A - 0.5 micron |
| Best for | Rye, wheat, millet & popcorn grains | Rye, wheat, millet & popcorn grains | Straw Pellets, Hardwood Pellets, Sawdust, Masters Mix, Soya Hulls & Wheat Bran | Straw Pellets, Hardwood Pellets, Sawdust, Masters Mix, Soya Hulls & Wheat Bran |
| Size | 4" × 3" × 18" 10 × 8 × 46 cm | 5" × 4" × 18" 13 × 10 × 46 cm | 19" × 8" × 5" 48 × 20 × 13 cm | 24" × 10" × 5" 61 × 25 × 13 cm |
All bags are 3.0 mil polypropylene — autoclave & pressure cooker safe at 121°C / 15 PSI