Proper storage is essential to maintain the quality and functionality of compostable bags. Unlike traditional plastic bags, compostable materials are more sensitive to environmental conditions like humidity, heat, and light. In this guide, we’ll cover the best practices to help you store compostable bags properly and extend their shelf life.
Why Proper Storage Matters for Compostable Bags
Compostable bags are made from natural materials such as cornstarch, PLA, and PBAT. These materials begin breaking down when exposed to certain elements—especially moisture and heat. Without the right storage conditions, bags may degrade prematurely, lose strength, or become sticky.
Key takeaway: Storing your compostable bags correctly helps ensure they stay usable and effective for their full shelf life.
Recommended Storage Conditions
Here’s how to store your compostable bags for best results:
1. Keep Them Cool
- Ideal temperature: 15–25°C (59–77°F).
- Avoid high heat: Don’t store bags near machinery, radiators, or windows with direct sunlight.
2. Avoid Humidity
- Store in a dry place with low humidity (<50% relative humidity).
- Moisture is the biggest threat to compostable bags—it accelerates decomposition.
3. Use Airtight Packaging for Long-Term Storage
- If you’re not using the bags immediately, keep them sealed in their original packaging or in airtight containers.
- Vacuum-sealed bags can extend shelf life by minimizing air exposure.
4. Keep Away from Direct Sunlight
- UV rays break down biodegradable materials.
- Store in a dark area or in opaque containers or boxes.
Shelf Life of Compostable Bags
Most compostable bags have a shelf life of 12 to 18 months when stored properly. After this period, they may still be functional, but there’s a higher risk of:
- Tearing or becoming brittle
- Sticky surfaces
- Reduced strength or load capacity
Tip: Always rotate stock using the First In, First Out (FIFO) method to ensure older bags are used first.
Storage Mistakes to Avoid
- Don’t store outdoors – Even under a cover, outdoor conditions can fluctuate too much.
- Don’t refrigerate or freeze – Extreme cold may alter material properties.
- Avoid stacking heavy items – Compostable bags are more flexible and could deform under pressure.
Best Practices for Businesses
If you’re a retailer, brand, or wholesaler using compostable bags:
- Train your staff: Ensure warehouse and logistics staff are aware of storage requirements.
- Label storage areas: Make it easy to identify where compostable bags should be kept.
- Check regularly: Inspect stored bags quarterly for early signs of degradation.
FAQ: How to Store Compostable Bags
Q: Can I store compostable bags in a garage or warehouse?
A: Yes, as long as the area is dry, well-ventilated, and stays within the recommended temperature range.
Q: Will compostable bags go bad if stored too long?
A: Yes. Over time, even in good conditions, compostable bags will gradually weaken. Use within 12–18 months for best performance.
Q: Can I repackage opened compostable bags?
A: Absolutely. Just make sure they’re sealed airtight and kept away from moisture and light.
