Unicorn 4T INJ — Mushroom Grain Spawn Bag (Small) w/ Injection Port
Unicorn 4T INJ — Mushroom Grain Spawn Bag (Small) w/ Injection Port
Pack size
Genuine Unicorn Bags from an official UK distributor
✔ In stock, posted within 1 working day
✔ Full range of 12 bag types in all pack sizes
✔ Trade and wholesale orders welcome
The Unicorn 4T-INJ is the same trusted 4T grain spawn bag with a factory-fitted self-healing injection port built in — ready for spore or liquid culture syringe inoculation straight out of the bag, no extra ports or tools needed. 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.
Specifications
- Filter: 0.2 micron T filter — tight filtration for grain spawn, minimises contamination risk during colonisation
- Injection Port: Factory-applied foam self-healing port, built in for syringe inoculation
- Capacity: 400g – 1kg of grain
- Size: 4" × 3" × 18"
- Material: 3.0 mil polypropylene — autoclave and pressure cooker safe at 121°C / 15 PSI
- Side-gusseted, reinforced bottom seal
Why growers choose the 4T-INJ
- No need to fit your own injection port or self-heal patch — it's built in at the factory
- Same tight 0.2 micron T filter as the standard 4T, ideal for smaller batches where contamination pressure matters most
- Compact footprint means you can fit more bags per autoclave run
- Perfect for hobbyists, small lab setups, and anyone working in the 1kg grain range
Need a bigger bag? The 10T-INJ holds up to 1.8kg with the same injection port. Don't need a port? See our standard 4T.
Need substrate bags instead? See our fruiting bag range.
In stock at our Glasgow warehouse. Dispatched same or next day.