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Replacement Grow Bags for Grow Kits
A replacement grow bag is a fresh fruiting bag with a sealing sticker that takes the place of the filter bag your grow kit came in, for when the original is torn, dirty or worn after a flush. Our Replacement Grow Bag + Sealing Sticker comes in Medium/Large and Extra Large, each matched to a size of our magic mushroom grow kits.
Why use a fresh bag for the next flush
The bag around your kit holds the humidity from the 150 ml of water at the bottom, keeps contaminants away from the substrate and is sealed by folding the top twice and closing it with the sticker. By the end of a flush it has been opened for air exchange, handled during harvest and often holds condensation and small bits of mushroom. Folds wear, stickers lose their grip and small tears appear. A new bag and sticker give the kit a clean start for a second flush and, in some cases, a third. If the original bag is still intact and clean, reusing it is fine; a replacement is a way to remove a weak point, not a requirement.
Which replacement grow bag fits your kit?
| Bag size | Fits |
|---|---|
| Medium/Large | Medium 750 cc and Large 1200 cc grow kits, including all special strains |
| Extra Large | Extra Large 2100 cc grow kits only |
Check the size on your kit's box or order before choosing. A bag that is too tight is hard to fold shut, and a bag that is too large leaves a lot of loose plastic to fold.
Moving your kit into a new bag
- Remove leftover stems and small aborted pins from the kit.
- Disinfect the lid and your work surface.
- Repeat the soak: cold drinking water, lid on, 9–12 hours in the refrigerator.
- Drain, then pour exactly 150 ml of drinking water into the bottom of the new bag.
- Place the kit inside, keep air in the bag, fold the top twice and close it with the new sealing sticker.
Then treat it as a fresh start: steady 23–25 °C, bright indirect light and the bag closed until pins appear. Most kits give two to four flushes in total, and later flushes are usually smaller. The grow kit manual covers the full routine, and how many flushes you can get explains what to expect from later rounds. A disinfectant mist bottle makes the cleaning step quicker.
Frequently asked questions
Do I need a new grow bag for the second flush?
Not always. If the original bag is clean, intact and still closes well, you can reuse it. A replacement grow bag is recommended when the bag is torn, dirty or no longer seals properly after the first flush.
Which replacement grow bag fits a 1200 cc grow kit?
The Medium/Large bag. It fits both the Medium 750 cc and the Large 1200 cc grow kits, which includes all special strains. The Extra Large bag is only for the Extra Large 2100 cc kit.
What is the sealing sticker for?
It closes the grow bag after you fold the top twice, so the humidity stays inside and the bag stays shut until pins appear. Every replacement grow bag comes with its own sealing sticker.
Can I use one replacement grow bag for several flushes?
A fresh bag is intended for the next flush and can in some cases also be used for the one after that. If it gets torn, dirty or stops sealing, swap it for a new one.
My grow bag has a tear. Can I keep growing?
Yes, but move the kit to a fresh bag as soon as you can. A tear lets humidity escape and lets unfiltered air reach the substrate. Choose the replacement size that matches your kit.
