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FlatStack® Paperboard Sheets

Made from 100% recycled fibers and completely recyclable, FlatStack paperboard sheets are a cost-effective solution that protects products on pallets during shipping, storage and retail display.

Protect Your Products


  • Top covers on pallets
  • Liners on pallets
  • Tier sheets between product layers to improve pallet cube integrity


  • Engineered for consistent performance on automated palletizers 
  • Designed specifically for this application
  • In-house design and testing capabilities offered

Compared to corrugated sheet:

  • Minimum 5% reduction in weight
  • Minimum 15% material cost savings
  • Lower freight costs—over two times more sheets shipped per truckload
  • Store five times the amount of sheets per unit of storage

FlatStack® Tier Sheets

 Sheets per PalletPallets per TruckloadSheets per Truckload
Corrugate C-Flute 150pt320 5617,920
Corrugate B-Flute 120pt4005622,400
FlatStack 24pt2,0002142,000
FlatStack 30pt1,6002133,600

Assuming 40"W x 48"L x 48"H


Calipers: 17-45pt
Design flexibility: square, round or custom corners and/or sizes
Custom die-cut designs available


Made with 100% recycled fiber
Minimum 85% post-consumer fibers
Acceptable in commercial OCC recycling programs
FSC certification is available (see below)

See the difference.

One pallet of FlatStack tier sheets yields 266 pallet cubes; one pallet of corrugated tier sheets yields only 53 pallet cubes.

FlatStack Ultralight®: Sonoco's Lightweight Value Offering

As a value-priced alternative to lightweight gypsum and paperboard sheets, FlatStack Ultralight® delivers exceptional performance, consistency in quality, and security of supply. When you use FlatStack Ultralight, you’ll know that you can get the quality tier sheet you need, when you need it – for a value price. 


  • Engineered for consistent performance on automated palletizers
  • Engineered and manufactured specifically for this application
  • Technical support for implementation, including process modeling
  • Recyclable
CaliperSheets per PalletSheets per Truckload

Assuming 40"W x 48"L sheet size, 22 pallets per truckload.

Strategic Locations Ensure Quick and Efficient Delivery

  • US and Canada
  • Europe
  • Asia
  • Brantford

    33 Park Avenue East  
    Brantford, ON,  

    Tel: 519-752-6591  
    Fax: 519-756-2811  
    Map Directions

  • City of Industry

    166 N. Baldwin Park Blvd. 
    Industrial Carriers Division 
    City of Industry, CA, 91746 
    United States

    Tel: 626-369-6927 
    Fax: 626-369-1688 
    Map Directions

  • Holyoke

    200 South Water Street 
    Holyoke, MA, 01040 
    United States

    Tel: 413-536-4546 
    Fax: 413-536-0903 
    Map Directions

  • Newport

    766 Industrial Road 
    Newport, TN, 37821 
    United States

    Tel: 423-623-8611 
    Fax: 423-613-1291 
    Map Directions

  • Chattanooga

    701 Manufacturers Road  
    Chattanooga, TN, 37405  
    United States

    Tel: 423-265-8937  
    Map Directions

  • Hartsville (Warehouse)

    420 Damascus Rd. 
    Hartsville, SC, 29550 
    United States

    Map Directions

  • Hartsville (Global Headquarters)

    1 North Second Street 
    Hartsville, SC, 29550 
    United States

    Tel: 843-383-7000 
    Map Directions

  • Richmond

    1850 Commerce Road 
    Richmond, VA, 
    United States

    Tel: 804-233-5411 
    Fax: 804-232-7061 
    Map Directions

  • Menasha

    69 Washington Street 
    Menasha, WI, 54952 
    United States

    Tel: 920-725-7115 
    Fax: 920-725-4869 
    Map Directions

  • DePere

    824 Fort Howard Avenue 
    DePere, WI, 54115 
    United States

    Tel: 920-336-4229 
    Fax: 920-336-6104 
    Map Directions

  • Wisconsin Rapids

    310 3rd Avenue North 
    Wisconsin Rapids, WI, 54495-2792 
    United States

    Tel: 715-422-7800 
    Map Directions

  • Sumner

    1802 Steele Avenue 
    Sumner, WA, 98390 
    United States

    Tel: 253-863-6366 
    Fax: 253-863-0223 
    Map Directions

US and Canada

In the US and Canada, Sonoco has 10 mills that offer a wide range of URB products, including edge protection, tube and core, tissue towel corestock, EcoTect® and FlatStack®.


All but two of our 23 global paperboard mills use 100% recycled fibers in their production. Sonoco is committed to responsible use of natural resources through responsible sourcing, recycling, and use of recycled fiber in our paper-based packaging. Sonoco's mills throughout Europe, the U.S., Canada, Brazil, China, and Mexico (Atizapan), are certified to one or more fiber certification programs. These are: the Forest Stewardship Council® (FSC®), Sustainable Forest Initiative® (SFI®) and the Program for the Endorsement of Forest Certification® (PEFC®) Chain of Custody and Due Diligence System Standards.


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FlatStack Paperboard Sheets

See what Sonoco can do for your business.

Learn more about our paperboard sheet offerings. We’re eager to discuss how we can help you meet your customers’ needs and your business goals.