Box Sizing Guide & Reference Tables
Your comprehensive guide to corrugated box dimensions, gaylord sizes, flute types, ECT ratings, and industry-specific size recommendations. Use this reference to find the right box for any application — then contact us for pricing.
Need Help Choosing a Size?
Tell us what you are packing and we will recommend the right box size, wall type, and quantity. Free, no-obligation sizing consultation.
How to Measure a Box
Box dimensions are always listed as Length x Width x Height (L x W x H). Understanding the difference between inside and outside dimensions is critical for choosing the right size.
Measuring Dimensions
Length (L)
The longest side of the box opening. Measure the longest dimension of the top opening from edge to edge.
Width (W)
The shorter side of the box opening. Measure the shorter dimension of the top opening from edge to edge.
Height (H)
The distance from the bottom of the box to the top. Measure from the base to the top of the side panel (not including flaps).
Inside vs. Outside Dimensions
Inside Dimensions (ID): The usable space inside the box. This is what matters when determining if your product will fit. Industry standard is to list inside dimensions when describing a box size.
Outside Dimensions (OD): The total external measurement of the assembled box. This is important for calculating shipping costs, pallet configurations, and storage space requirements.
The Difference:Outside dimensions are typically 1/4" to 1/2" larger than inside dimensions per side, depending on wall thickness. For a single-wall C-flute box, add approximately 5/16" per side. For double-wall BC-flute, add approximately 1/2" per side.
Pro Tip: When telling us what size you need, always specify whether you are providing inside or outside dimensions. When in doubt, measure your product and add 1-2 inches per dimension for cushioning material.
How to Choose the Right Box Size
The right box protects your product, minimizes wasted space, and reduces shipping costs. Follow these guidelines to select the best size for your needs.
Measure Your Product
Measure the length, width, and height of your product (or the largest item if packing multiples). Add 1-2 inches per dimension for cushioning material such as bubble wrap, foam, or packing paper.
Consider Weight
Match box strength to product weight. Items under 20 lbs typically need single-wall 32 ECT. Items 20-40 lbs need single-wall 44 ECT or double-wall. Items over 40 lbs require double-wall 48+ ECT.
Minimize Void Space
Excess empty space inside a box means more cushioning material needed, higher shipping costs from dimensional weight pricing, and greater risk of product shifting and damage during transit.
Stacking Requirements
If boxes will be stacked on pallets or in storage, you need higher ECT ratings and stiffer flute types. C-flute and BC-flute provide the best stacking performance for palletized loads.
Shipping Method
Parcel carriers (UPS, FedEx) charge dimensional weight for oversized boxes. Right-sizing saves money. LTL and truckload shipments prioritize pallet configuration and stacking strength.
Ask Us for Help
Not sure what size or specification you need? Our team has helped over 1,000 businesses find the right box. Contact us with your product details and we will recommend the optimal solution.
Standard Corrugated Box Sizes
The most commonly used corrugated box dimensions in inches (L x W x H). All sizes listed are inside dimensions. We carry most of these sizes in used inventory — contact us for availability and pricing.
| Size (L x W x H) | Common Use | ECT | Wall | Flute |
|---|---|---|---|---|
| 6 × 6 × 6 | Small parts, samples, retail items | 32 | Single | C |
| 8 × 6 × 4 | Books, small electronics, cosmetics | 32 | Single | B |
| 10 × 8 × 6 | Shoes, small appliances, hobby supplies | 32 | Single | C |
| 12 × 10 × 8 | Medium products, office supplies | 32 | Single | C |
| 12 × 12 × 12 | General purpose, cube-shaped products | 32 | Single | C |
| 14 × 14 × 14 | Kitchen items, medium equipment | 32 | Single | C |
| 16 × 12 × 8 | Clothing, textiles, printed materials | 32 | Single | C |
| 18 × 12 × 12 | Medium goods, mixed product packing | 32 | Single | C |
| 18 × 18 × 16 | Bulk packing, large kitchen items | 44 | Single | C |
| 20 × 14 × 10 | Auto parts, industrial components | 44 | Single | C |
| 20 × 20 × 20 | Large goods, warehouse storage | 44 | Single | C |
| 24 × 18 × 12 | Bedding, large retail items | 44 | Double | BC |
| 24 × 18 × 18 | Moving boxes, bulk consumer goods | 48 | Double | BC |
| 24 × 24 × 24 | Large cube items, packing peanut fill | 48 | Double | BC |
| 30 × 18 × 16 | Furniture parts, large equipment | 48 | Double | BC |
| 36 × 24 × 12 | Flat items, artwork, mirrors | 48 | Double | BC |
| 36 × 24 × 24 | Appliances, heavy industrial parts | 51 | Double | BC |
| 48 × 24 × 24 | Long items, machinery components | 51 | Double | BC |
ECT = Edge Crush Test (lbs per lineal inch). Higher ECT = greater stacking strength. All dimensions in inches. Sizes shown are inside dimensions (ID). Custom sizes available upon request.
Gaylord Box Sizes
Gaylord boxes (bulk bins) are large, heavy-duty corrugated containers designed for pallet-sized loads. All sizes listed are inside dimensions in inches. Weight capacity varies by wall construction and condition.
| Size (L x W x H) | Wall | Flap Style | Weight Capacity | Typical Use |
|---|---|---|---|---|
| 40 × 32 × 34 | 2-Wall | Full Bottom | 1,500 lbs | Lightweight bulk goods, plastics, textiles |
| 48 × 40 × 24 | 2-Wall | Full Bottom | 1,800 lbs | Produce, food products, shorter stack goods |
| 48 × 40 × 36 | 2-Wall | Full Bottom | 2,000 lbs | General purpose bulk, most common gaylord size |
| 48 × 40 × 36 | 3-Wall | Full Bottom | 2,500 lbs | Heavier goods, auto parts, hardware |
| 48 × 40 × 48 | 2-Wall | Full Bottom | 2,200 lbs | Tall bulk goods, lightweight high-volume items |
| 48 × 40 × 48 | 3-Wall | Full Bottom | 3,000 lbs | Heavy industrial parts, metal components |
| 48 × 40 × 48 | 5-Wall | Full Bottom | 4,500 lbs | Maximum weight capacity, heavy machinery parts |
| 48 × 45 × 36 | 3-Wall | Full Bottom | 2,800 lbs | Wider pallet format, specialized logistics |
| 58 × 42 × 36 | 3-Wall | Full Bottom | 3,200 lbs | Oversize pallet loads, furniture components |
| 48 × 40 × 36 | 2-Wall | Half Flap | 1,800 lbs | Easy access loading, warehouse operations |
Weight capacities are approximate maximums for new boxes. Used gaylords may have reduced capacity depending on condition and grade. All dimensions in inches (ID). We carry used gaylords in 2-wall, 3-wall, and 5-wall options.
Corrugated Flute Types
The flute is the wavy layer between the liners of corrugated board. Different flute profiles provide different combinations of cushioning, stacking strength, and printability. Understanding flute types helps you match the box to the job.
| Flute Type | Thickness | Flutes/Ft | Cushioning | Stacking | Best For |
|---|---|---|---|---|---|
| A-Flute | 3/16" | 33-36 | Excellent | Good | Fragile items, cushion-critical products |
| B-Flute | 1/8" | 47-52 | Good | Excellent | Die-cut displays, canned goods, retail packaging |
| C-Flute | 5/32" | 39-43 | Very Good | Very Good | General shipping (most common), balanced performance |
| E-Flute | 1/16" | 90-98 | Fair | Fair | Retail presentation, pizza boxes, lightweight items |
| F-Flute | 1/24" | 125+ | Minimal | Fair | Fast food packaging, cosmetic boxes, POP displays |
| BC-Flute | 1/4" | Double | Excellent | Excellent | Heavy items, double-wall applications, industrial shipping |
Single-Wall
One layer of fluted medium between two liners. Most common for standard shipping boxes. Suitable for items up to 40 lbs. Available in A, B, C, and E flute.
Liner → Flute → LinerDouble-Wall
Two layers of fluted medium separated by a middle liner. Significantly stronger than single-wall. Used for heavy items (40-80 lbs) and stacking applications. Typically BC-flute.
Liner → Flute → Liner → Flute → LinerTriple-Wall
Three layers of fluted medium. Maximum strength for extremely heavy items (80-300 lbs). Used for industrial parts, machinery, and applications where a wooden crate would otherwise be required.
Liner → Flute → Liner → Flute → Liner → Flute → LinerUnderstanding ECT Ratings
Edge Crush Test (ECT) measures the stacking strength of corrugated board in pounds per lineal inch. Higher ECT means the box can bear more weight when stacked. Choose the right ECT based on your product weight and stacking requirements.
| ECT Rating | Wall Type | Max Content Weight | Recommended For |
|---|---|---|---|
| 23 ECT | Single-Wall | Up to 20 lbs | Lightweight items, small parcels, retail packaging |
| 26 ECT | Single-Wall | Up to 25 lbs | Books, documents, light consumer products |
| 29 ECT | Single-Wall | Up to 35 lbs | General purpose shipping, e-commerce orders |
| 32 ECT | Single-Wall | Up to 40 lbs | Most common — standard shipping and storage |
| 40 ECT | Single-Wall | Up to 50 lbs | Heavy single-wall applications, dense products |
| 44 ECT | Single-Wall | Up to 55 lbs | Heavy goods, machine parts, food cases |
| 48 ECT | Double-Wall | Up to 80 lbs | Heavy products, multi-tier stacking, palletized loads |
| 51 ECT | Double-Wall | Up to 100 lbs | Very heavy items, industrial equipment, appliances |
| 61 ECT | Double-Wall | Up to 120 lbs | Maximum double-wall strength, heavy machinery components |
| 71 ECT | Triple-Wall | Up to 300 lbs | Extreme weight, crate replacement, export shipping |
ECT ratings assume proper pallet loading and stacking practices. Actual performance may vary based on humidity, box age, and loading conditions. Used boxes may have slightly reduced ECT values compared to their original rating.
Size Recommendations by Industry
Not sure what size to order? Here are our most common recommendations for six major industries we serve in the Treasure Valley. These are starting points — contact us for a custom sizing consultation.
E-Commerce & Retail
Recommended Sizes
- ▸8×6×4 for small items
- ▸12×10×8 for medium products
- ▸16×12×8 for clothing
- ▸24×18×12 for large items
Right-size your box to minimize void fill and reduce dimensional weight charges. B-flute or C-flute single-wall is sufficient for most e-commerce shipments under 20 lbs.
Food & Beverage
Recommended Sizes
- ▸12×12×12 for canned goods
- ▸18×12×12 for bottled beverages
- ▸24×18×12 for mixed cases
- ▸48×40×36 gaylords for bulk ingredients
Use wax-coated or poly-lined boxes for moisture-sensitive products. C-flute provides good stacking strength for palletized food shipments. Consider 32-44 ECT for stacking loads.
Manufacturing & Industrial
Recommended Sizes
- ▸20×14×10 for parts
- ▸24×24×24 for equipment
- ▸36×24×24 for heavy components
- ▸48×40×48 gaylords for bulk parts
Double-wall (BC-flute) recommended for items over 30 lbs. Use 48+ ECT for stacking stability. Gaylords with 3-wall or 5-wall construction for heavy loose parts.
Agriculture & Produce
Recommended Sizes
- ▸18×12×8 for berry flats
- ▸24×16×10 for vegetable cases
- ▸48×40×24 gaylords for bulk produce
- ▸48×40×36 gaylords for root crops
Wax-coated boxes are essential for wet produce. Ventilation holes or hand-hold cuts improve airflow and handling. Consider used gaylords for farm storage and transport.
Moving & Relocation
Recommended Sizes
- ▸12×12×12 small box (books, heavy items)
- ▸18×18×16 medium box (kitchen, general)
- ▸24×18×18 large box (bedding, clothing)
- ▸24×24×24 extra-large box (pillows, linens)
Used boxes are ideal for moving — same protection at 30-50% less cost. Grade A or B boxes perform identically to new for single-move applications. Stock up on multiple sizes.
Pharmaceuticals & Healthcare
Recommended Sizes
- ▸8×6×4 for OTC products
- ▸12×10×8 for medical supplies
- ▸14×14×14 for equipment
- ▸24×18×12 for case packs
Insulated boxes with foam liners for temperature-sensitive products. Clean, Grade A boxes recommended for pharmaceutical applications. Consider E-flute for retail pharmacy packaging.
Used Boxes, Same Performance
A quality used box in Grade A or B condition retains 85-95% of its original rated strength. For most applications — shipping, storage, moving, and warehousing — that performance difference is negligible.
By choosing used boxes from Boise Boxes, you get the sizes you need at 30-50% less cost, while diverting packaging from landfills and reducing demand for new corrugated board production. Every box reused saves trees, water, and energy.
Calculate Your Eco Impact →Need a Size We Haven't Listed?
Our inventory changes daily and includes many non-standard sizes. If you need a specific dimension, wall type, or quantity, contact us — we can likely source it from our network within 48 hours.