What is the International Stash Shipper?

2:30 min. read / 1:38 min. watch

Traveling and need to send your frozen stash back home? The International Stash Shipper by Milk Stork gives you 96 hours of cooling power, so your milk stays frozen and safe during transit. 🧊✈️

📦 What’s in the Box?

• Pre-paid FedEx International Priority return label (all customs documents electronically uploaded)

• Capacity: Holds up to 180 oz of frozen breast milk (capacity established using 6oz bags of milk frozen flat in Lansinoh bags)

• Outer Dimensions: 12.3” x 11.5” x 11.7”

🧊 How It Works (No Activation Required)

The cooler doesn’t arrive cold—and that’s by design.
There’s no activation button because our vacuum-insulated panels kick into action the moment your frozen milk is packed. From there, you get up to 96 hours of cooling time.

🚨 Pro Tips for a Seamless Shipment

• Ship on Monday, Tuesday, or Friday to avoid weekend delays

• Milk must be fully frozen before packing

• Freeze bags flat in zip top storage bags to maximize cooler space

• Avoid bulky bags like Willow/Kiinde—they reduce how much you can pack

• Pack just before dropping off with FedEx.  📦 Want to pack like a pro? 👉 Click here for expert packing instructions

• Your label says ETD, that means no extra paperwork is needed—it’s all handled electronically

✈️ Shipping from Abroad? Here’s the Quick Scoop:

Your pre-labeled FedEx box comes ready to go—just look for the "ETD" label (no extra paperwork needed).
Scheduled pick-ups are not available for international shipments. Be sure to check if your hotel or destination can assist, or plan to drop off at a nearby FedEx location.

🕒 Shipping on a Thursday? Your milk may not arrive until Monday.

Delivery takes up to 3 business days (no weekend delivery)
🌍 Customs, weather, or service delays can affect transit time.
📋 Know the local shipping rules for your current country.
✍️ A signature is required, so sign up for FedEx Delivery Manager to track, adjust, or pre-sign for your delivery.

📬 What to Expect When Your Milk Arrives

As soon as your cooler arrives, pop that milk straight into the freezer. 💨🧊

Don’t stress if it looks fully frozen, partially frozen, or a little slushy—that’s totally normal! Breast milk varies based on your body’s unique fat content, so texture and even smell can differ from bag to bag. A soapy or grassy scent? Totally safe. 

✨ Pro tip: If there are still ice crystals, it’s not fully thawed and can safely be refrozen. If it’s completely liquid, use it within 24 hours.

All shipments are via FedEx and subject to their Terms of Use.