I remember standing in my kitchen at 2 a.m., holding a used Medela bag and thinking—can I just rinse this and use it again? I was tired, my freezer was full, and I didn’t want to waste another bag.
If you’ve had that same moment, you’re not alone. The question—“Are Medela bags reusable?”—comes up for a lot of moms. And it’s easy to see why. Between the cost, the mess, and the nonstop pumping, it’s tempting to reuse them.
So let’s make it clear: Most Medela storage bags are not reusable. But there are a few safe, reusable options out there. And knowing the difference matters.
In this guide, I’ll show you:
- Why Medela’s single-use label exists
- The risks of reusing (even just once)
- Smart, safe storage options if you want to go reusable
Whether you’re building a freezer stash or just trying to save money, this info can help you keep every ounce safe—and lower your stress, too.
Table of Contents
Can You Reuse Medela Breast Milk Bags?
What Are Medela Breast Milk Storage Bags Made Of?
Medela’s milk storage bags are made from food-safe plastic called polyethylene. They’re BPA-free, leak-proof, and pre-sterilized. That makes them great for one-time use.
They’re soft and easy to freeze flat. But that same softness means they can break down if reused. These bags aren’t made to be washed or used again.
Why does that matter? Because once the inner lining wears out, it can hold bacteria or even release tiny plastic bits. That’s not something you want in your baby’s milk.
What Does Medela Say About Reusing Their Bags?
Medela is very clear:
“Our breast milk storage bags are for single use only.”
That’s from the brand itself. It’s not just a tip—it’s a safety rule.
Medela doesn’t recommend washing or boiling their bags. After one use, they may not stay sealed, sterile, or safe.
If it’s been used once—even from the fridge—it’s done.
Why Reusing Medela Bags Is Risky
I know. These bags are expensive. I used to feel bad tossing them too—especially in those early days when every penny counted.
But I stopped trying to reuse them. Here’s why:
- Bacteria can hide. Even a rinse can’t clean the small creases where milk sticks.
- Washing breaks them down. Hot water and soap make the plastic weak and likely to tear.
- They’re not sterile after use. The seal won’t be tight again, and any small damage can let germs in.
- Microplastics are real. Thin plastic can shed tiny bits into milk if used too often.
One time, I reused a bag for quick fridge storage. The next day, it had a small tear at the seam. I lost four ounces—and yes, I cried. That was the last time I took that shortcut.
Your baby’s milk is too precious to trust a bag that wasn’t made to be reused.
Which Medela Bags Are Reusable?
Medela Silicone Breast Milk Storage Bags
Now, not all Medela bags are single-use. Medela also makes silicone breast milk storage bags—and these are made to be reused.
I discovered them during my second pumping journey, and honestly, they were a game changer.
What makes them different?
- They’re made of soft, food-grade silicone, not plastic.
- They’re BPA-free and dishwasher-safe.
- You can reuse them again and again without worrying about safety.
They feel totally different—thicker, stretchier, and much sturdier. You can boil them, freeze them, or toss them in the top rack of your dishwasher.
How long do they last?
With regular use, most moms say these silicone bags can last for several months—sometimes even longer if cared for gently. I used mine daily for about 5 months before they started to wear at the seams.
Cleaning tips that worked for me:
- Rinse them with cold water first (it helps with milk fat).
- Then wash with mild soap and warm water or toss into the dishwasher.
- Let them air dry completely before using again.
They even stand upright on their own, which makes pouring a lot less messy!
If you’re pumping often and tired of throwing out bags every day, these silicone ones are worth a look.
How to Know If You Have the Reusable or Disposable Kind
It’s easy to get them mixed up, especially when you’re running on two hours of sleep. Here’s a quick way to tell:
| Feature | Disposable Medela Bags | Reusable Medela Silicone Bags |
| Material | Thin plastic (polyethylene) | Soft, thick silicone |
| Feel | Crinkly, flexible | Smooth, rubbery, stretchable |
| Reusability | One-time use only | Made for repeated use |
| Cleaning | Not washable | Dishwasher and boil safe |
| Standing design | Lays flat, doesn’t stand alone | Can stand upright on its own |
| Closure | Zip-top seal | Secure silicone plug or seal |
When I first switched, I kept one of each bag on the counter for comparison. Once you feel them side-by-side, it’s super obvious which is which.
If you’re ever unsure, just check the label or product listing. Medela’s silicone bags usually say “reusable” right on the packaging.
Safe Storage Alternatives If You Need Reusable Options
Top Reusable Breast Milk Storage Solutions
If you want to stop using single-use bags, there are great options out there. I’ve tested most of them over the years, and here’s what I love.
Silicone Breast Milk Storage Bags
These are the most popular reusable choice—and for good reason.
- Brands to try: Medela, Haakaa, Junobie, Zip Top
- What’s great: Soft, strong, and made to be reused
- Safe for: Freezer, boiling, dishwasher, and travel
Most are leak-proof with tight lids. Many can stand up on their own. I like that they’re made from food-grade silicone—no plastic bits, no leaks.
Downsides? They need a deep clean and take up more freezer space than flat bags.
Glass Bottles or Mason Jars
If you’re mostly at home or using the fridge, glass is a great pick.
- Best for: Long-term storage and safety
- Works with: Bottle nipples or silicone lids
I’ve used 4oz mason jars and Medela glass bottles. They’re sturdy, last forever, and clean up fast. I label them with dry-erase markers.
Downsides? They’re heavier, can break, and not ideal for freezing large batches.
What I Personally Use (and Why)
I’ve tried just about every storage method out there. What works for me now is a mix:
When I’m on the go or pumping at work: I use Medela silicone bags. They’re light, don’t leak, and fit in a cooler.
At home: I use glass jars or bottles. They stack well in the fridge, and I feel better not using plastic.
Here’s what I’ve learned:
Silicone bags
✅ Reusable, flexible, freezer-safe
❌ Need careful cleaning, can stain with time
Glass containers
✅ Easy to clean, eco-friendly
❌ Bulky, not great for pumping into
Having both gives me peace of mind. I’m not worried about running out of bags—and I don’t throw away plastic every day like I used to.
Final Answer – Can You Reuse Medela Bags?
Quick Summary
If you’re skimming for the bottom line, here it is:
- Regular Medela plastic bags? ❌ Not reusable. They’re made for one-time use only—and trying to wash or reuse them can lead to leaks, germs, or even lost milk.
- Medela silicone bags? ✅ Totally reusable. They’re strong, safe, and built to handle daily use, cleaning, freezing—you name it.
I know it’s tempting to stretch your stash or save a few bucks by reusing plastic ones. I’ve been there. But trust me—it’s not worth the risk.
There are smart, safe, and reusable options out there now. And they’re getting better every year.
Your milk is liquid gold. Your storage solution should protect it—not gamble with it.
FAQs: Are Medela bags reusable?
Are Medela bags reusable or single-use only?
Medela’s regular plastic milk bags are for one-time use. They’re not safe to wash or boil after use.
What happens if I reuse Medela plastic milk bags?
They can leak or tear, and old milk may stay in tiny spots—raising the risk of germs.
Which Medela bags are reusable?
Only the silicone ones. They’re soft, strong, and made to be used over and over again.
How can I tell if my Medela bag is reusable or not?
If it’s plastic, it’s for one use. Silicone bags feel thick and stretchy—and the box will say “reusable.”
What are safer options if I want reusable milk storage?
Try silicone bags (like Medela or Haakaa) or glass jars. Both are safe and better for the planet.
