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Women's Business Enterprise

ISO 9001:2015 certified

ISO 9001:2015

Flat Shipping Boxes: Corrugated Options

Explore Alliance Packaging Group's comprehensive selection of flat shipping boxes designed for secure transportation of delicate items. Our corrugated flat boxes feature specialized designs including telescoping options, side loading configurations, and self-seal closures for maximum protection during transit.

14 x 4 x 68" Side Loading Boxes
Telescopic Flat Boxes
White Stayflats® Mailers
2-Piece Flat Boxes
Guitar Boxes
Flat Boxes
TerraBoard™ Jumbo Flat Mailers
20 x 8 x 60" Side Loading Boxes
Golf Boxes
Side Loading Boxes
Side Loading Stayflats Lite® Mailers
Ski Box
Self-Seal Side Loading Boxes
White Side Loading Locking Mailers
4-Piece Flat Boxes

Our Range of Products
14 x 4 x 68" Side Loading Boxes

14 x 4 x 68" Side Loading Boxes

  • End Insertion Loading
  • Full Overlap Flaps
  • 68-inch Long Configuration
Telescopic Flat Boxes

Telescopic Flat Boxes

  • Adjustable Two-piece Design
  • FOL Bottom Strength
  • Telescoping Height Adjustment
White Stayflats® Mailers

White Stayflats® Mailers

  • 100% Recycled Paperboard
  • Pressure-sensitive Closure
  • Do Not Bend Message
2-Piece Flat Boxes

2-Piece Flat Boxes

  • Moving Industry Design
  • Fragile Glass Protection
  • Printed Fragile Warnings
Guitar Boxes

Guitar Boxes

  • End Opening Design
  • Full Overlap Flaps
  • ECT-44 Construction
Flat Boxes

Flat Boxes

  • 170+ Configurations
  • Shallow Product Ideal
  • Enhanced Durability

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Frequently Asked Questions

What ECT ratings are available for flat shipping boxes?

We offer ECT-32, ECT-44, and ECT-48 ratings depending on your protection requirements and product specifications.

Can I get custom dimensions for specialized shipping needs?

What is the difference between side loading and regular flat boxes?

Are your flat mailers environmentally friendly?

What shipping options are available for bulk orders?

Do you provide fragile item protection features?

Can I get samples before placing a large order?

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

Industries We Serve

Manufacturing

Manufacturing

Secure packaging solutions for flat products, long items, and specialized manufacturing components requiring protective shipping.

E-commerce

E-commerce

Self-seal flat mailers and corrugated boxes perfect for online retail shipments of documents, artwork, and fragile items.

Art & Design

Art & Design

Protective flat boxes and mailers designed specifically for shipping artwork, frames, and delicate design materials safely.

Sports Equipment

Sports Equipment

Specialized boxes for golf clubs, skis, and other sporting goods requiring long, narrow, or custom-fit packaging solutions.

Didn't find what you're looking for?

Talk to our experts for custom solutions and tailored guidance.

You might also like

Telescopic Flat Boxes | Flat Shipping Boxes for Art Packaging

Flat Shipping Boxes for Art Packaging

Specialized flat shipping boxes designed for safe art packaging and transportation. Our corrugated solutions feature adjustable designs, heavy-duty protection, and side-loading convenience to ensure artwork, frames, and fragile items arrive undamaged. Available in multiple configurations with nationwide delivery.
14 x 4 x 68" Side Loading Boxes | Flat Shipping and Packing Boxes

Flat Shipping and Packing Boxes

Flat shipping and packing boxes designed for efficient storage and transportation of flat, fragile, or oversized items. Our comprehensive selection includes side-loading, telescoping, and specialty flat boxes with adjustable sizing, self-seal closures, and heavy-duty protection for secure shipping across industries.
1/2" Heavy-Duty Serrated Seal Sealer | 16 x 16 x 4 Corrugated Shipping Boxes

16 x 16 x 4 Corrugated Shipping Boxes

High-quality 16 x 16 x 4 corrugated shipping boxes designed for secure transport and storage. Our selection includes heavy-duty, multi-depth, and telescoping options with ECT ratings from 32 to 90. Perfect for manufacturing, distribution, warehousing, and shipping applications with factory-direct pricing and immediate availability.

Why Manufacturing & Distribution Companies Choose Alliance Packaging Group

Factory Direct Pricing Advantage

Get costs lower than industry standard with competitive volume pricing programs that reduce your packaging expenses significantly.

Immediate Stock Availability

Over 10,000 packaging products truly in stock for same-day shipment with nationwide just-in-time delivery programs.

Single-Source Solution Provider

Complete packaging and material handling solutions with custom engineering by experienced team for operational efficiency.

Get Custom Quotes for Your Flat Shipping Box Requirements

Connect with our packaging experts for personalized recommendations and competitive volume pricing on corrugated flat boxes.

Contact Us Today

For immediate assistance, feel free to give us a direct call at 770-309-1012. You can also send us a quick email at sales@apg-go.com.