---
product_id: 279945187
title: "40 Pack, Mushroom Grow and Spawn Bags - Extra Thick Polypropylene Material, Tear Resistant - Size 13\" x “4 x “4 with 0.2 Micron Filter Breathable - Spawn Rye"
brand: "outward creations"
price: "€ 65.80"
currency: EUR
in_stock: true
reviews_count: 8
category: "Outward Creations"
url: https://www.desertcart.be/products/279945187-40-pack-mushroom-grow-and-spawn-bags-extra-thick-polypropylene
store_origin: BE
region: Belgium
---

# withstands 15 psi sterilization heat 0.2 micron breathable filter pad 2x thicker tear-resistant polypropylene 40 Pack, Mushroom Grow and Spawn Bags - Extra Thick Polypropylene Material, Tear Resistant - Size 13" x “4 x “4 with 0.2 Micron Filter Breathable - Spawn Rye

**Brand:** outward creations
**Price:** € 65.80
**Availability:** ✅ In Stock

## Summary

> 🍄 Grow Like a Pro: Tough, breathable, and ready to elevate your mushroom game!

## Quick Answers

- **What is this?** 40 Pack, Mushroom Grow and Spawn Bags - Extra Thick Polypropylene Material, Tear Resistant - Size 13" x “4 x “4 with 0.2 Micron Filter Breathable - Spawn Rye by outward creations
- **How much does it cost?** € 65.80 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/279945187-40-pack-mushroom-grow-and-spawn-bags-extra-thick-polypropylene)

## Best For

- outward creations enthusiasts

## Why This Product

- Trusted outward creations brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Sterilization Ready:** Designed to endure high-pressure steam sterilization at 15 psi without melting or rupturing—perfect for professional-grade cultivation.
- • **Breathe Easy, Grow Better:** Integrated 0.2 micron filter pad allows optimal gas exchange while blocking contaminants—your mushrooms’ clean air advantage.
- • **Pro-User Approved Workflow:** Compatible with impulse sealers and innovative inoculation hacks like injection port stickers for seamless liquid culture use.
- • **Built to Last, Twice as Strong:** Extra thick polypropylene material ensures tear resistance and durability for multiple grow cycles.
- • **Maximized Capacity & Versatility:** Generous 13" x 4" x 4" size fits up to 4 lbs of grain spawn, ideal for oyster, ganoderma, and more—scale your grow effortlessly.

## Overview

This 40-pack of extra thick polypropylene mushroom grow bags (13" x 4" x 4") features a 0.2 micron breathable filter pad for contaminant-free gas exchange. Engineered to resist tears and withstand sterilization at 15 psi, these bags support large-scale spawn and substrate cultivation for oyster, ganoderma, and other mushrooms. Trusted by experienced growers, they enable efficient inoculation and robust fruiting cycles, making them a must-have for serious mycology enthusiasts.

## Description

VALUE PACK: 40 Thick Polypropylene mushroom grow bags. Each bag 13" x “4 x “4 - includes a 0.2 Micron Protection Pad for gas exchange and prevents contaminants from entering the bag.

Review: Works every time, with proper practice. - I've used these bags for about 3 years, they work fine with an impulse sealer or even a hair straightener, if your sealer is burning these, chances are like me and didn't read the instructions, when using an impulse sealer you must apply pressure 10 seconds after the impulse seal light has gone off or you WILL burn through your bags everytime. If that isn't the case then your sealer needs calibration. I've learned that thicker is not necessarily better, thicker bags crack more often. I recommend no thicker than 6mil. These bags hold up too at least 3 hours at 15psi. Back to practice, if your having contam issues asses your practice, these bags are perfect, and can fit so much more than with jars. These work good even for no soak no simmer tek. Avid customer here lol I can always rely on these bags
Review: Works great if you follow some simple rules - I've been using these bags for 6 months for grain spawn (both rye and oats) and they work great! I will be ordering them again. They do not need to be wrapped with towels and will not melt in a pressure cooker, even when touching metal sides (IF you make sure there is enough water in the pressure cooker). This is best achieved by getting a trivet or riser to allow at least 2-3" of water in your pressure cooker. This is especially crucial if sterilizing for 2+ hours at 15 psi. Ruptured bags in pressure cooker has only happened to me when I pre-seal the bags before pressure cooking, Melting has only occurred when my pressure cooker runs out of water (riser has been a game changer). Make sure you put something on top of the grain bags to prevent blocking pressure cooker venting and exploding (use original bottom rack for this if you get a riser). NEW TRICK: use a small paper hole punch to create bag vent and pre-seal bags before pressure cooking (punch hole below where you want to seal; can fold bag edge a bit to get hole punch 1-2" below sealing edge). Then it is super easy to add a small sticker based filter patch to the whole you punched once bags cool...then use resealable injection port stickers to inoculate w/ liquid culture (once grain bags cooled). I use a standard food sealer instead of an impulse sealer. This requires letting it cool for 60-120 seconds before opening lid of food sealer to cool the seal enough to not weaken the seam when you peel it off the heat strip. Peel vertically to keep seal best intact. I have used whole rye grain for 15 years and I recently switched to whole oats from Tractor Supply. At $20/ 50 lbs, not only are whole oats way cheaper, they do not burst and dissolve as easy as rye and can withstand 2 hours+ at 15 psi in the pressure cooker. Using no soak, no simmer method with oats is awesome! Weigh your oats, and use 75% of that volume for your water measurement (3 lbs of oats needs 2.25 lbs of water). Also, water can be weighed and has the same weight # as Liters or ml.... So make your life easier! These bags in my opinion, max out with 4lbs of grain (dry) to allow for some mixing ability in the bag. You can do less work!

## Features

- VALUE PACK: 40 Thick Polypropylene mushroom grow bags. Each bag 13" x “4 x “4 - includes a 0.2 Micron Protection Pad for gas exchange and prevents contaminants from entering the bag.
- Tear Resistant: 2x thicker than most bags. Grow Bags allow plenty of room for mushroom growing and spawn, substrate and fruiting.
- Multi use for inoculation with mushroom oyster spawn, clone oyster mushrooms, ganoderma, dictyophora, and more
- Bags designed to withstand high temperatures that come with sterilization.
- Mushroom bags are suitable for spawn, rye grain, wood chips, substrate for mushroom farming, they can be also applied for spawn and as a fruiting bag spores

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08T4RB15V |
| Best Sellers Rank | #124,161 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #229 in Plant Grow Bags |
| Brand Name | Outward Creations |
| Color | Silver |
| Customer Reviews | 4.4 out of 5 stars 96 Reviews |
| Finish Types | Unfinished |
| Included Components | Plant Hanger |
| Indoor Outdoor Usage | Indoor |
| Item Dimensions | 7.87 x 4 x 13 inches |
| Item Dimensions D x W x H | 4"D x 4"W x 12"H |
| Item Weight | 0.29 kg |
| Manufacturer | Outward Creations |
| Material | Polypropylene (PP) , Wood |
| Material Type | Polypropylene (PP), Wood |
| Number of Pieces | 40 |
| Other Special Features of the Product | UV Resistant |
| Pattern | Solid |
| Plant or Animal Product Type | Fruit |
| Planter Form | Bag |
| Product Style | Modern |
| Shape | Rectangular |
| Size | 13" x “4 x “4 |
| Special Feature | UV Resistant |
| Style | Modern |
| Theme | Mushrooms |
| Unit Count | 40 Count |

## Product Details

- **Color:** Silver
- **Material:** Polypropylene (PP), Wood
- **Planter Form:** Bag
- **Special Feature:** UV Resistant
- **Style:** Modern

## Images

![40 Pack, Mushroom Grow and Spawn Bags - Extra Thick Polypropylene Material, Tear Resistant - Size 13" x “4 x “4 with 0.2 Micron Filter Breathable - Spawn Rye - Image 1](https://m.media-amazon.com/images/I/61v-SbfJ6mL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works every time, with proper practice.
*by B***A on February 26, 2023*

I've used these bags for about 3 years, they work fine with an impulse sealer or even a hair straightener, if your sealer is burning these, chances are like me and didn't read the instructions, when using an impulse sealer you must apply pressure 10 seconds after the impulse seal light has gone off or you WILL burn through your bags everytime. If that isn't the case then your sealer needs calibration. I've learned that thicker is not necessarily better, thicker bags crack more often. I recommend no thicker than 6mil. These bags hold up too at least 3 hours at 15psi. Back to practice, if your having contam issues asses your practice, these bags are perfect, and can fit so much more than with jars. These work good even for no soak no simmer tek. Avid customer here lol I can always rely on these bags

### ⭐⭐⭐⭐⭐ Works great if you follow some simple rules
*by A***. on July 2, 2026*

I've been using these bags for 6 months for grain spawn (both rye and oats) and they work great! I will be ordering them again. They do not need to be wrapped with towels and will not melt in a pressure cooker, even when touching metal sides (IF you make sure there is enough water in the pressure cooker). This is best achieved by getting a trivet or riser to allow at least 2-3" of water in your pressure cooker. This is especially crucial if sterilizing for 2+ hours at 15 psi. Ruptured bags in pressure cooker has only happened to me when I pre-seal the bags before pressure cooking, Melting has only occurred when my pressure cooker runs out of water (riser has been a game changer). Make sure you put something on top of the grain bags to prevent blocking pressure cooker venting and exploding (use original bottom rack for this if you get a riser). NEW TRICK: use a small paper hole punch to create bag vent and pre-seal bags before pressure cooking (punch hole below where you want to seal; can fold bag edge a bit to get hole punch 1-2" below sealing edge). Then it is super easy to add a small sticker based filter patch to the whole you punched once bags cool...then use resealable injection port stickers to inoculate w/ liquid culture (once grain bags cooled). I use a standard food sealer instead of an impulse sealer. This requires letting it cool for 60-120 seconds before opening lid of food sealer to cool the seal enough to not weaken the seam when you peel it off the heat strip. Peel vertically to keep seal best intact. I have used whole rye grain for 15 years and I recently switched to whole oats from Tractor Supply. At $20/ 50 lbs, not only are whole oats way cheaper, they do not burst and dissolve as easy as rye and can withstand 2 hours+ at 15 psi in the pressure cooker. Using no soak, no simmer method with oats is awesome! Weigh your oats, and use 75% of that volume for your water measurement (3 lbs of oats needs 2.25 lbs of water). Also, water can be weighed and has the same weight # as Liters or ml.... So make your life easier! These bags in my opinion, max out with 4lbs of grain (dry) to allow for some mixing ability in the bag. You can do less work!

### ⭐⭐⭐⭐⭐ Perfect size for a beginer
*by N***Y on October 6, 2023*

Quality is great. Really helps with a rookie margin of error. The smaller size also allows me to try different things without blowing the bank on grain spawn supplies.

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-09-19*