Mylar Bags are one of the most reliable options for food storage, product packaging, and long-term preservation. Their durability, moisture resistance, and light-blocking properties make them a favorite for industries like food, supplements, and cannabis—as well as for home preppers.
But here’s the key: even the best Mylar Bags won’t protect your products unless they’re sealed correctly. A poor seal lets in oxygen and moisture, cutting shelf life and risking spoilage.
At Packaging Services, we’ve helped countless businesses and individuals get professional results with Custom Mylar Bags Wholesale. In this guide, we’ll walk you through exactly how to seal Mylar Bags properly—step by step.
Step 1: Choose the Right Mylar Bags
Not all Mylar bags are the same. Thickness, size, and closure style all affect sealing success.
- Thin Mylar Bags (3.5 mil): Great for short-term use or single servings.
- Thicker Mylar Bags (5–7 mil): Better for long-term food storage or bulkier items.
- Custom Printed Mylar Bags: Ideal for businesses that want branding and storage combined.
At Packaging Services, we recommend ordering Mylar Bags Wholesale to ensure you always have the right size and thickness for your needs.
Step 2: Gather Your Sealing Tools
You’ll need the right equipment to get a reliable seal. Options include:
- Heat Sealer (Best Option): Designed for packaging, ensures consistent seals.
- Clothing Iron: Works in a pinch, but harder to control heat.
- Hair Straightener: Popular among home users for small pouches.
Pro tip: For businesses, investing in a commercial heat sealer is the smartest choice. It saves time and guarantees professional results.
Step 3: Fill the Mylar Bags Properly
Before sealing, make sure to fill your Mylar Bags correctly:
- Leave about 2–3 inches of space at the top for sealing.
- Avoid overfilling, as this creates weak seals.
- For food storage, add the correct number of oxygen absorbers before sealing to prevent spoilage.
Step 4: Position the Bag for Sealing
Smooth out the top of the bag to remove wrinkles. Even small folds can cause leaks. Place the open edge of the Custom Mylar Bag into your sealer or under your iron/straightener.
If using an iron, set the bag across a flat, heat-resistant surface (like a wooden board) and press the iron across the top. For consistency, seal one side at a time.
Step 5: Apply Heat Evenly
Heat is the secret to a strong seal. Too little, and the bag won’t close properly. Too much, and the material may melt.
- With a heat sealer, set the temperature according to bag thickness.
- With an iron or straightener, use medium-high heat and apply firm, even pressure.
- Hold for about 2–4 seconds per section until the bag bonds completely.
You should see a straight, smooth line where the bag is sealed shut.
Step 6: Check Your Seal Carefully
Once the Mylar Bag is sealed, inspect it:
- Look for wrinkles or gaps along the seal.
- Gently tug the edges to ensure they don’t pull apart.
- If you’re sealing food for long-term storage, squeeze the bag slightly to confirm no air leaks.
For extra security, some businesses double-seal their Custom Mylar Bags—one seal at the very top and another half an inch below.
Step 7: Store the Bags Correctly
Even a perfect seal won’t protect your products if the bags are stored poorly. Keep sealed Mylar Bags in a cool, dry, and dark environment. For long-term food storage, place them in airtight bins or buckets for added protection.
Common Mistakes to Avoid When Sealing Mylar Bags
- Skipping oxygen absorbers when storing dry goods.
- Overfilling the bag and leaving no space for sealing.
- Using too little heat, creating weak seals.
- Storing in hot or humid areas, which damages contents.
By avoiding these mistakes, you’ll get the maximum shelf life and freshness out of your Custom Printed Mylar Bags.
Why Businesses Trust Packaging Services for Mylar Bags
At Packaging Services, we provide high-quality Custom Printed Mylar Bags designed to make sealing easy and reliable. Whether you need small pouches for samples or large bags for bulk storage, we offer:
- Durable materials that seal tightly and last.
- Custom designs with branding, compliance info, and instructions.
- Wholesale options to save money while scaling production.
- Expert guidance on choosing the right bags for your industry.
Final Thoughts on Sealing Mylar Bags
Sealing Mylar Bags properly isn’t complicated—but it does require attention to detail. From choosing the right bag thickness to applying even heat, every step matters.
When done right, sealed Custom Mylar Bags protect products, extend shelf life, and boost your brand’s professionalism. And with help from Packaging Services, you can get packaging that seals securely every time.
If you’re ready to upgrade your packaging process, explore our Mylar Bags Wholesale options today and take your sealing game to the next level.
