Insulated Packaging Built to Keep Perishables Safe in Transit
Cold Chain & Perishables
Insulated Packaging Built to Keep Perishables Safe in Transit
A 1–2 day shipping window is a race against temperature. Whether you're shipping baked goods, a meal kit, or lab specimens, the wrong packaging is the difference between a happy customer and a spoiled shipment.
Temperature-sensitive shipments don't get a second chance. Once a perishable order leaves your facility, the packaging is the only thing standing between it and however long the truck sits on a hot dock or a doorstep in the sun. COOLPAC® insulated packaging is engineered specifically for that 1–2 day transit window — a reflective metalized film and padded insulation that keeps internal temperature stable without the weight or bulk of a full cold-shipping setup.
Standalone Mailer or Box Liner? Here's How to Choose
Both use the same reflective insulation technology. The difference is whether you're shipping without an outer box, or need to add cold protection inside a box you're already using.
COOLPAC® Insulated Thermal Mailers
From $41.95 per case · 4 sizes, #2 up to #8
A reflective metalized film with padded insulation, ready to ship on its own — no outer box required. Tamper-evident self-seal for fast, secure packing. Works with or without gel packs depending on how far or how hot the route is.
Best for: baked goods & confections, meal kits, gourmet gifts, lab specimens shipped without a box
COOLPAC® Insulated Thermal Box Liners
From $60.82 per case · 5 sizes, 6″ up to 12″×10″×9″
A lighter-weight reflective liner with a durable bubble interior that drops into a standard corrugated box in seconds. Adds insulation and shock absorption without changing your existing box supply chain.
Best for: flowers & live plants, meal kits, perishable foods already shipping boxed
Know Your Transit Window
Insulation Buys You Time — Gel Packs Buy You More
COOLPAC® packaging is engineered to maintain consistent internal temperature during a 1–2 day transit window on its own. For longer routes, hotter climates, or genuinely fragile temperature thresholds — pharmaceuticals and lab specimens especially — adding a gel pack extends that protection further without changing your packaging.
The right call depends on your actual ship times, not a worst-case guess: a same-day local delivery may not need a gel pack at all, while a cross-country shipment in July almost always should have one. See our full Cold Chain packaging guide for sizing and format details.
Ordering By the Case
Built for Businesses Shipping Perishables Every Week
Both COOLPAC® products are priced to reward volume, so scaling from a trial case to a standing order lowers your cost per case — not just your cost per shipment.
Thermal Mailers savings per case
Box Liners savings per case
Ordering 100+ cases, or setting up a recurring standing order? Contact our team for a custom volume quote — we'll send you a discount code to apply in your cart, then you check out right on mailersusa.com like any other order.
Frequently Asked Questions
Do I need gel packs with COOLPAC® packaging?
Not always. COOLPAC®'s reflective insulation is built to maintain temperature on its own during a standard 1–2 day transit window. Add a gel pack for longer routes, hot climates, or genuinely temperature-critical contents like pharmaceuticals and lab specimens.
Should I use a thermal mailer or a box liner?
Use a Thermal Mailer when you're shipping without an outer box — it's a standalone insulated envelope. Use a Box Liner when you're already shipping in a standard corrugated box and want to add cold protection without changing that box supply chain.
What size should I order for my products?
COOLPAC® Mailers come in 4 sizes and Box Liners in 5, sized to fit anything from a single confection to a full meal kit or bouquet. Most businesses stock 1–2 sizes per product type based on their most common order size.
How many cases should we order to unlock volume pricing?
20 cases is where per-case savings start to matter on both products, and it's a common reorder size for businesses shipping perishables weekly. Above 40 cases the savings grow further, and orders of 100+ cases get custom pricing.
Ready to Protect Your Next Temperature-Sensitive Shipment?
Whether you're shipping your first batch of gourmet treats or scaling a weekly meal kit run, our team will help you land on the right COOLPAC® sizes and quantities.