Standard Operating Procedures: How to Store Bulk Hash Using the Paper Bag Method


Todde Philips
🇺🇸 Retired veteran, father, rock-climbing expert & rosin connoisseur.
Proper bulk hash storage can make or break your final product. You've spent countless hours dialing in your wash, perfecting your rinsing and collection technique, and carefully drying your resin. The last thing you want is to compromise all that hard work with poor storage practices that degrade terpene content, invite contamination, or cause unnecessary product loss.
Most hash makers default to glass jars for storage, and while jars have their place, they're not always the most practical solution for bulk quantities. That's where The Press Club's preferred standard operating procedure comes in: the paper bag method. This approach maximizes efficiency while protecting your precious resin until you're ready for the next phase of processing.
The Benefits of Unbleached Parchment Bags
The foundation of this storage method relies on unbleached parchment bags. Think of them as paper sandwich bags, but made specifically from chlorine-free parchment without any paraffin wax or chemical coatings that could contaminate your product.
These bags are food-safe and incredibly gentle on resin. Unlike other storage materials that can stick to or interact with your hash, parchment bags maintain complete neutrality. The resin won't adhere to the interior surface, which means you can access and use every gram you've stored without losing product to container walls.
Why Proper Loose Resin Storage Matters
When bulk hash sits in suboptimal conditions, several problems can emerge quickly. Moisture contamination tops the list of concerns, especially if your resin wasn't completely dry before storage. Even small amounts of residual moisture can lead to mold development, turning months of work into compost.
Terpene degradation is another major issue. Those volatile compounds that give your hash its distinctive aroma and effects are sensitive to environmental factors. Poor storage can cause these precious molecules to break down or evaporate, leaving you with less flavorful, less potent final products.

Then there's the practical matter of product loss during transfers and handling. Every time you move resin from one container to another, you risk leaving behind sticky residue that represents lost revenue and wasted material.
The Paper Bag SOP: Step by Step
The process starts after your resin is completely dry. Fill each parchment bag with enough loose resin to hit the sweet spot between efficiency and manageability without over stressing the bag material. The exact weight varies depending on the size of the bags, but for the size we use, it's 300-350g per bag. We're using bags that are 7.5 x 6.4 x 2.3 inches.
Once filled, fold the top of the bag over and secure it using tape or clips. The goal is creating a sealed environment that protects the resin from external contamination while remaining easy to access when needed.
Next, place your sealed parchment bag inside a larger ziplock bag. This creates an additional vapor barrier that provides extra protection against moisture infiltration. The double-bag approach might seem excessive, but it's insurance against the kind of storage failures that can ruin entire batches.
Finally, store these double-bagged units in your freezer until you're ready for further processing or final packaging. The cold temperature helps preserve terpenes and prevents any degradation during extended storage periods.
Advantages Over Traditional Glass Jar Storage

Space efficiency represents one of the biggest advantages of the paper bag method. Bags are naturally stackable and conform to available freezer space much better than rigid glass containers. When you're dealing with large quantities of hash, this flexibility can determine whether everything fits in your storage setup.
Product loss becomes virtually nonexistent with parchment bags. Glass jars notoriously trap resin on their walls, and scraping out every last bit can be time-consuming and wasteful. Bags eliminate this problem entirely since resin doesn't stick to the parchment surface.
From a cost perspective, bags are significantly more affordable than glass jars, especially when you factor in replacement needs. Bags can be disposed of after use, eliminating the cleaning and sanitization requirements that come with reusable containers.
The reduced handling requirements also protect trichome integrity. Less scraping and transferring means less mechanical damage to those delicate resin heads you've worked so hard to preserve.
Pro Tips for Maximum Success
Always verify that your resin is completely dry before bagging. Any residual moisture will create problems down the line, regardless of how perfect your storage technique might be. When in doubt, extend your drying time rather than risk contamination.
For long-term storage exceeding a few weeks, consider triple-bagging with an additional outer layer for maximum moisture protection. Label each bag clearly with strain information, processing date, and batch numbers to maintain proper inventory tracking.
Keep handling to an absolute minimum once bags are sealed and stored. Every time you manipulate stored hash, you risk compromising trichome structure and introducing contaminants.
Storage Pitfalls
Avoid overfilling bags. Overstuffed bags become difficult to seal properly and are more likely to tear during handling. Never use bleached or wax-coated bags, as these materials can introduce unwanted chemicals into your product.
Perhaps most importantly, don't skip the outer vapor barrier step. That extra ziplock bag provides crucial protection that can save entire batches from moisture-related failures.
The paper bag method represents The Press Club's approach to bulk hash storage because it addresses the real-world challenges that both commercial and home extractors face daily. Proper storage isn't just about preservation; it's about maintaining the quality and integrity that defines top-tier solventless products from the garden all the way to the consumer.
Thoughts? Let us know by joining our secret Facebook group. Hang out with a community of like-minded solventless heads like yourself. Ask our head extractor questions, share your latest press and learn from hobbyists and experts in the industry.
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