Cold Chain
Cold Chain & Temperature-Sensitive Packaging
COOLPAC® Insulated Mailers & Box Liners Built for Perishables, Pharma & Lab Specimens
Temperature-sensitive shipments don't get a second chance — if a package sits too long in transit, the product inside can spoil, degrade, or become unusable before it reaches the customer. MailersUSA supplies COOLPAC® insulated packaging built specifically for that problem: a reflective metalized film and padded or bubble-lined insulation designed to help maintain internal temperature during 1–2 day transit windows*, whether you're shipping perishable food, meal kits, pharmaceuticals, or lab specimens.
COOLPAC® comes in two formats so you can match it to how you already pack: Thermal Mailers, a lightweight, self-sealing insulated envelope for direct shipping, and Thermal Box Liners, which slide inside the box you already use to add cold-chain performance without switching box suppliers. Both work with or without gel packs depending on your shipping duration and temperature requirements.
Built to Ship Perishables, Direct to the Customer's Door
If your business ships fresh or perishable contents on a recurring basis — think weekly meal-kit boxes, subscription food deliveries, or farm-to-door produce — cold chain performance isn't optional, it's the product experience. COOLPAC® is built for exactly that kind of high-frequency, direct-to-consumer perishable shipping:
- Consistent insulation performance across every box, every week, so recurring subscribers get the same fresh-arrival experience every time
- Two formats to match your fulfillment flow — Thermal Mailers for direct-ship items, Box Liners to add cold-chain protection to the boxes you already run on your pack line
- Sized to handle everything from a single-recipe mailer to a full multi-recipe, multi-day box
- Bulk case pricing built for high-volume, recurring fulfillment schedules rather than one-off shipments
We Understand Cold Chain Shipping
Shipping something perishable or temperature-sensitive raises the stakes on every packaging decision you make.
Common challenges cold chain shippers face:
- Narrow transit windows where every hour of delay increases spoilage risk
- Balancing enough insulation to protect the product against added weight and shipping cost
- Customer complaints, refunds, and reshipments when products arrive warm or damaged
- Keeping packaging consistent across seasonal temperature swings
COOLPAC® insulated mailers and box liners are built to address these exact challenges.
How MailersUSA Fits Into Your Cold Chain Operation
Maintains Product Integrity
- Reflective metalized film helps regulate internal temperature in transit
- Padded or bubble-lined interior adds shock absorption alongside insulation
- Works with or without gel/cold packs depending on your shipping duration
Keeps Shipping Costs Down
- Lightweight, space-saving construction reduces freight cost versus rigid coolers
- Right-sized formats avoid paying to ship excess insulation you don't need
Simplifies Packing
- Tamper-evident self-seal closure on Thermal Mailers speeds up high-volume packing
- Box Liners drop into your existing box sizes — no new box vendor required
Shop COOLPAC® Insulated Packaging
COOLPAC® Insulated Thermal Mailers
A lightweight, self-sealing insulated mailer with reflective metalized film and padded insulation. Ships direct with no outer box needed — ideal for perishable foods, meal kits, gourmet gifts, pharmaceuticals, and lab specimens.
From $41.95 / case
Shop Thermal Mailers
COOLPAC® Insulated Thermal Box Liners
A reflective, bubble-lined liner that fits inside the box you already use. Adds cold-chain performance and impact cushioning to your existing packaging — popular for meal kits, flowers & live plants, and larger perishable orders.
From $60.82 / case
Shop Box LinersCOOLPAC® Size & Format Guide
| Format | Size | Case Qty | Price | Best For |
|---|---|---|---|---|
| Thermal Mailer (#2) | 8" x 11" | 100 | $41.95 | Single-serving items, lab specimens, small samples |
| Thermal Mailer (#6) | 12" x 17" | 100 | $78.25 | Multi-item meal kits, medium perishable shipments |
| Thermal Mailer (#7) | 15" x 17" | 100 | $91.85 | Larger meal kits, bulkier perishable orders |
| Thermal Mailer (#8) | 22" x 18" | 100 | $110.25 | Large multi-item or bulk perishable shipments |
| Box Liner | 6" x 6" x 6" | 100 | $65.61 | Small cube boxes — single portions, samples |
| Box Liner | 8" x 8" x 8" | 100 | $98.04 | Standard cube boxes — meal kits, small gift sets |
| Box Liner | 10" x 10" x 10" | 50 | $75.97 | Larger cube boxes — bigger perishable orders |
| Box Liner | 11" x 8.5" x 5.5" | 60 | $60.82 | Rectangular boxes — flatter items, multi-pack shipments |
| Box Liner | 12" x 10" x 9" | 50 | $78.61 | Larger rectangular boxes — bulkier cold shipments |
Pro Tip: Box Liners are sized to fit standard corrugated box dimensions, so you can add cold-chain protection to boxes you're already sourcing without changing suppliers.
Solving Common Cold Chain Packaging Challenges
Protecting Product Integrity — Reflective insulation helps regulate internal temperature through typical 1–2 day transit windows, reducing spoilage and quality complaints.
Controlling Shipping Costs — Lightweight COOLPAC® construction keeps freight costs down compared to rigid foam coolers, while right-sizing avoids paying to ship insulation you don't need.
Reducing Returns & Reshipments — Consistent, reliable insulation performance cuts down on the refunds and reshipments that come from products arriving warm or damaged.
Fitting Your Existing Workflow — Choose Thermal Mailers to ship direct with no box, or Box Liners to add cold-chain performance to the boxes you already use.
How Cold Chain Shippers Put This Into Practice
A typical scenario: a meal-kit or gourmet food brand shipping mixed orders switches from rigid foam coolers to COOLPAC® Thermal Box Liners inside their existing boxes for standard multi-item orders, and COOLPAC® Thermal Mailers for smaller single-item shipments that don't need a full box. The result is lower freight cost from lighter packaging, faster pack times since both formats seal quickly, and consistent temperature performance across order sizes — without adding a second packaging vendor.
Frequently Asked Questions
How long can COOLPAC® maintain temperature in transit?
COOLPAC® Thermal Mailers and Box Liners are engineered to help maintain consistent internal temperatures during typical 1–2 day transit windows. Actual performance depends on ambient conditions, contents, and whether gel or cold packs are used.
Do I need to use gel packs with COOLPAC®?
Not necessarily. Both formats are designed to work with or without gel/cold packs — add them for longer transit times or more sensitive products, and skip them for shorter routes or less critical items.
Will the Box Liner fit the boxes I already use?
COOLPAC® Box Liners are built to fit standard corrugated box dimensions and are available in five sizes from 6"x6"x6" up to 12"x10"x9". Check the size guide above against your current box dimensions, or contact our team if you need help matching a liner to a non-standard box.
Are COOLPAC® mailers suitable for pharmaceuticals and lab specimens?
Yes. COOLPAC® Thermal Mailers and Box Liners are used by businesses shipping pharmaceuticals, supplements, and lab specimens, in addition to perishable food and meal kits.
Can we get a custom quote for high-volume cold chain shipping?
Yes. For larger or recurring orders across multiple COOLPAC® sizes, contact our team for a custom volume quote — we'll send you a discount code to apply in your cart.
Packaging Comparison for Cold Chain Shippers
| Option | Best For | Cost Efficiency | Pack Speed | Protection Level |
|---|---|---|---|---|
| COOLPAC® Thermal Mailers | Direct-ship perishables, pharma & lab specimens | High | Fast | Medium-High |
| COOLPAC® Thermal Box Liners | Larger or multi-item cold shipments in your own box | Medium | Fast | High |
| AIRJACKET® Bubble Mailers | Non-perishable items in the same order | Medium | Medium | High |
| Boxes (uninsulated) | Structured items with no temperature sensitivity | Low | Slower | Low |
Customization & Flexible Pricing
- Multiple sizes across both Thermal Mailer and Box Liner formats
- Flexible pricing structures based on case volume
- Reliable supply to support seasonal demand spikes
- Custom volume quotes for multi-SKU or recurring cold chain orders
Built for Every Kind of Cold Chain Operation
- Meal kit, bakery, and gourmet food brands
- Subscription box companies shipping perishable contents
- Pharmaceutical, supplement, and lab specimen shippers
- Florists and live plant shippers
- 3PLs handling temperature-sensitive client accounts
Get Started with MailersUSA
Protect what matters in transit with insulated packaging built for 1–2 day cold chain transit windows. Ordering across multiple sizes or need a recurring quote? Request a custom quote and we'll send you a discount code to apply in your cart.
Shop Thermal Mailers Shop Box Liners Request a Custom Quote
From Our Blog
Look for our dedicated Cold Chain packaging guide coming soon.