---
product_id: 464488637
title: "50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8\" X 5\" X 20\" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks"
brand: "gymgit"
price: "¥11185"
currency: JPY
in_stock: true
reviews_count: 12
category: "Gymgit"
url: https://www.desertcart.jp/products/464488637-50-pack-mushroom-grow-bags-heavy-duty-6-mil-polypropylene
store_origin: JP
region: Japan
---

# 8" x 5" x 20" large size bags 0.2-micron breathable filter patch 6 mil heavy-duty polypropylene 50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks

**Brand:** gymgit
**Price:** ¥11185
**Availability:** ✅ In Stock

## Summary

> 🍄 Grow Bold, Grow Smart — Your Premium Mushroom Cultivation Partner

## Quick Answers

- **What is this?** 50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks by gymgit
- **How much does it cost?** ¥11185 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/464488637-50-pack-mushroom-grow-bags-heavy-duty-6-mil-polypropylene)

## Best For

- gymgit enthusiasts

## Why This Product

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

## Key Features

- • **Spacious & Standout:** Generous 8" x 5" x 20" gusseted bags provide a sturdy, upright form that holds up to 8 lbs of substrate with ease.
- • **Breathe Easy, Grow Better:** Integrated 0.2-micron filter patch allows optimal gas exchange while blocking contaminants—grow like the pros.
- • **Bulk Pack for Serious Growers:** 50-pack supply keeps your cultivation game strong—whether hobbyist, educator, or professional farmer.
- • **Versatile Cultivation Powerhouse:** Perfect for oyster, Ganoderma, and other mushroom species; ideal for spawn bags and sawdust fruiting blocks.
- • **Built to Last, Designed to Perform:** Heavy-duty 6 mil polypropylene ensures durability and high-temp resistance for flawless sterilization cycles.

## Overview

This 50-pack of Gymgit Mushroom Grow Bags features heavy-duty 6 mil polypropylene construction with large 8" x 5" x 20" gusseted design, capable of holding up to 8 pounds of substrate. Each bag includes a 0.2-micron breathable filter patch for optimal gas exchange and contamination prevention, making them ideal for professional and hobbyist mushroom growers alike. Durable, sealable, and versatile, these bags support a wide range of mushroom species and cultivation methods, delivering a reliable, space-saving solution for efficient mushroom farming.

## Description

desertcart.com : Gymgit 50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks : Patio, Lawn & Garden

Review: Excellent! - These are great. Quality made and solid. thickness is standard- these are easy to use/seal. (If you don't have a heat sealer, just tape shut with micropore tape. If you don't have that, then just some clear box tape (like moving box tape) They are great at keeping moisture in without being too wet, and the filter patch is perfect. You can slowly push air out of it once your substrate is inoculated.
Review: Good quality bags - While the thickness doesn't feel like 6mil, these bags are solid. I ran one through my insta pot for 90min and it worked flawlessly. If your bags are exploding, you need to heat seal them better. The bags are quite big and definitely a good value at $0.50/bag. Will buy again for sure.

## Features

- Sealable and Durable: Mushroom substrate bags are made of polypropylene plastic designed to withstand high temperatures. The plastic is durable and clear enough to make monitoring growth easy. Can be sealed with an impulse sealer, or can just be tied to the seal.
- Reliable and Efficient: 50 Pack of 5 (gusset) x 20" (long) x 8 (wide) Mushroom bags can hold 5-8 pounds. Mushroom grow bags produce a side-gusseted style that gives a sturdy stand-up bag after filling and a strong bottom seal, effectively protecting your mushrooms or other plants.
- Excellent Breathable Filterability: mushroom grow bags with a 0.2-micron filter allow free exchange of gas while preventing the entry of pollutants. Grow like a pro mushroom growers around the globe use these bags to dramatically reduce space needed to grow or spawn mushrooms when compared to trays and tubs.
- Wide Application: Multi-use for inoculation of clone oyster mushrooms, bamboo fungus Ganoderma mushrooms, and more. They can also be applied to spawn bags and sawdust fruiting blocks. Great for school projects, hobbies, and even professional mushroom growers, farmers, and mushroom cultivation.
- What You Get: 50 Pack Farm Mushroom Spawn Bags. Each mushroom substrate bag that encounters problems in use can get a 24-hour response and solution. Five-Star Shopping Experience at Gymgit.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B4DJSHD8 |
| Assembly required | No |
| Batteries required | No |
| Best Sellers Rank | #50,122 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #176 in Plant Grow Bags |
| Brand | Gymgit |
| Capacity | 8 Pounds |
| Color | Clear |
| Customer Reviews | 4.4 4.4 out of 5 stars (390) |
| Finish Type | Unfinished |
| Finish types | Unfinished |
| Included Components | Plant Hanger |
| Indoor/Outdoor Usage | Indoor, Outdoor |
| Item Weight | 1 pounds |
| Item model number | Mushroom Grow Bags |
| Manufacturer | Gymgit Store |
| Material | Polypropylene (PP) |
| Mounting Type | Floor Standing |
| Number of Levels | 1 |
| Number of Pieces | 50 |
| Pattern | Solid |
| Planter Form | Vertical |
| Product Dimensions | 5"D x 8"W x 20"H |
| Shape | Rectangular |
| Size | 50-Pack |
| Special Feature | Bagged |
| Style | Antique |
| Theme | Mushroom Cultivation |

## Product Details

- **Color:** Clear
- **Material:** Polypropylene (PP)
- **Planter Form:** Vertical
- **Special Feature:** Bagged
- **Style:** Antique

## Images

![50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks - Image 1](https://m.media-amazon.com/images/I/718hcguRouL.jpg)
![50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks - Image 2](https://m.media-amazon.com/images/I/71nb3FsYphL.jpg)
![50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks - Image 3](https://m.media-amazon.com/images/I/81DJeC3Q9LL.jpg)
![50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks - Image 4](https://m.media-amazon.com/images/I/81Bzsfd+51L.jpg)
![50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks - Image 5](https://m.media-amazon.com/images/I/71VZwh-OKGL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: How can I seal the bag without an impulse sealer?**
A: I use a vacuum sealer, without the vacuum.

**Q: Can this bag be autoclaved or put in a pressure cooker?**
A: Yes. I just ran four bags through the pressure cooker this week and they all came out in perfect condition.

**Q: Where do i inject i thought i could go through the filter but that doesnt seem like a good idea. Can i tape over my holes?**
A: i would buy some injection ports, tape them onto hte bag, and inject through that, otherwise you'll leave an opening on your bag and that's going to be a source of contamination. I bought 100 filter injection ports on amazon for like 9 bucks, and i just tape them to the exterior of my bags that dont come with their own ports, and inject through that. You'll have a much better success rate, if you leave any kind of opening you can expect that 40% of your bags (or more, depending on your conditions) will contaminate. Never inject directly through the plastic.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent!
*by C***H on October 17, 2025*

These are great. Quality made and solid. thickness is standard- these are easy to use/seal. (If you don't have a heat sealer, just tape shut with micropore tape. If you don't have that, then just some clear box tape (like moving box tape) They are great at keeping moisture in without being too wet, and the filter patch is perfect. You can slowly push air out of it once your substrate is inoculated.

### ⭐⭐⭐⭐⭐ Good quality bags
*by B***B on September 20, 2024*

While the thickness doesn't feel like 6mil, these bags are solid. I ran one through my insta pot for 90min and it worked flawlessly. If your bags are exploding, you need to heat seal them better. The bags are quite big and definitely a good value at $0.50/bag. Will buy again for sure.

### ⭐⭐⭐⭐⭐ Highest quality I’m a repeat buyer!! No lie!
*by J***K on November 14, 2024*

These bags are great. If you’re into mycology, these bags are for you. They have high performance capabilities that allow them to not melt while being pressure cooked. These bags never rip or tear. They are clean and deliver on time! Thank you!!!

## Frequently Bought Together

- Gymgit 50 Pack, Mushroom Grow Bags, Heavy Duty 6 Mil Polypropylene Mushroom Substrate Bags, Large Size 8" X 5" X 20" for Mushroom Cultivation, Spawn Bags, and Sawdust Fruiting Blocks
- Myco Labs Microppose Self Healing Injection Ports for Mushroom Spawn Bags and Jar Lids (50-Pack)
- Impulse Heat Sealer Machine Manual Bags, 12 Inch, for Sealing Plastic/PE PP Bags with Extra Replace Element Grip

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-19*