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ECMA F40.01.00.00.22

Triangular Folding Carton with Hinged Lid

  • Available in a wide range of custom configurations & material selection.
  • Order 1 sample. Or order 100K+ units. Or anything in between.
  • Affordable delivery across North America.
  • Design support, warehousing, testing, assembly available.
  • Widest machinery capability in America via 30+ specialist partner plants.
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Product details

Top highlights

  • Triangular tray with three rounded corners
  • Hinged full-cover lid with front tuck lock
  • Glueless manual assembly

About this product

A distinctive, one-piece triangular carton featuring three rounded corners and a hinged full-cover lid. Delivered flat and assembled without glue, the side walls interlock to form a front slit that secures the lid's tuck tongue.

This format is a natural fit for bakery slices, cosmetics, and premium retail presentations where the unique shape adds display value. Because it relies on manual interlocking, it is often chosen for prep-ahead kitting rather than high-speed automated packing.

Common uses

  • Bakery (pie/cake/pizza slices)
  • Cosmetics
  • Premium retail
  • Promotional kits

Get a quote

Share what you know. We'll take it from there. Or email us at info@herculeindustrial.com

Best Price Guarantee

Already have a packaging quote? Let us beat it.

Send us the quote you have. We will beat it for the same specifications, quantity, and delivery requirements.

Upload a competing quote

Free quote review. No obligation.

30+specialist partner plants

We supply through the plant best suited to your price, material, production, and delivery requirements.

Why we can beat a lower quote

30+ plants give us more ways to lower the price.

Each plant has different machinery, material costs, order minimums, and freight rates. Our buying volume helps us secure better pricing. We then quote through the plant that gives you the lowest total price for your requirements.

Send us your current quote. Watch us beat it.

Attach it to the quote form or email it to us. We'll review it free and send you our price.

Upload a competing quoteinfo@herculeindustrial.com
Best Price Guarantee terms

To qualify, send a written supplier quote dated within the past 30 days and addressed to your company. It must cover the same dimensions, construction, material, print, finish, quantity, tooling, freight, delivery date, and delivery location. The guarantee does not cover taxes, expired quotes, liquidation or clearance sales, or obvious pricing errors.

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Triangular slice packaging and retail displays

Bakery and specialty food slices

The triangular footprint naturally accommodates pie, cake, or pizza slices. The hinged lid provides easy access for the consumer, while the rounded corners offer a softer, premium presentation.

Premium retail and promotional kits

The distinctive shape stands out on retail shelves compared to standard rectangular boxes. It works well for cosmetics, small gifts, or promotional items where the unboxing experience matters.

Boutique confectionery and chocolate assortments

When fitted with custom inserts, the triangular tray presents truffles or wrapped chocolates in an unexpected format, using the wide lid for branding.

Apparel accessories and rolled soft goods

Rolled ties, scarves, or socks can fit neatly into the triangular cavity, turning a simple accessory into a ready-to-gift presentation.

Bakery, boutique retail, and corporate gifting

Bakery and takeaway operations

For food applications, the board should be specified with appropriate barrier coatings to handle grease or moisture. The manual assembly means this is often better suited for prep-ahead operations rather than high-speed, on-demand counter service.

Boutique retail and gift shops

The glueless construction and interlocking front corner provide a clean, finished look without visible adhesive seams, supporting high-end graphics and premium finishes.

Corporate gifting and promotional kitting

The unique shape helps promotional kits stand out. Because these programs often involve manual kitting, the hand-assembly requirement is usually already factored into the fulfillment plan.

When to compare other triangular formats

High-volume automated packing

The interlocking front corner and friction-fit tuck tongue require manual manipulation. If your packing line relies on automated carton erectors, a standard glued tray or a different closure style is often a better fit.

Direct parcel shipping

The friction lock is designed for retail handling and presentation. For mixed-carrier transit, the carton usually needs a protective outer corrugated shipper to prevent the lock from opening or the corners from crushing.

Board thickness, manual assembly, and route planning

Board thickness and lock clearance

The front locking slit is formed by the interlocking side walls. If you specify a thicker material, such as a micro-flute, the cut length and tuck tongue width should be adjusted to ensure the lock functions without tearing or binding.

Manual assembly labor

Because the carton relies entirely on mechanical interlocking rather than pre-glued seams, packing teams fold the back wall, interlock the front corner, and secure the lid for every unit.

Outer shipping and transit protection

If the carton will be shipped individually through courier networks, plan for an outer shipping box. The non-glued walls and friction lock are optimized for hand-offs and retail shelves, not rough sorting facilities.

Food contact and barrier coatings

When packing greasy or moist food slices directly, the board choice and internal coating become critical to prevent the paperboard from weakening or staining.

Corner radii, windows, and lock adjustments

Corner radii adjustments

The curvature of the three rounded corners can be adjusted. However, large changes to the front corner radius may alter how the side walls interlock and require modifications to the locking slit.

Adding a display window

A window can be cut into the large triangular lid to display the product, provided enough border material remains to maintain the lid's stiffness and the integrity of the front tuck tongue.

Tuck tongue width and slit length

The width of the front locking tab and the corresponding slit can be widened or narrowed to adjust the friction fit, depending on the board thickness and expected handling.

Board and packing details

Grain direction and panel bowing

For larger triangular cartons, the grain direction of the paperboard should run perpendicular to the back hinge to help prevent the broad base and lid panels from bowing, ensuring a flat presentation.

Additional notes

Front lock retention testing

The security of the front tuck tongue depends on the board thickness and the exact cut length of the slit. Always request a physical sample in your chosen material to verify the lock holds securely during normal handling.

Related packaging options

FAQs

Assembly and Packing

Does this carton require glue or tape to assemble?

No. It is a one-piece blank that uses mechanical interlocking. The side walls wrap and lock at the front corner, and the lid secures with a tuck tongue. Tape or seals are only needed if you require tamper evidence.

Can this box be erected by automated machinery?

The complex interlocking front corner requires manual folding and manipulation. It is generally not a fit for standard automated carton erectors.

Material and Fit

Can I use corrugated board for this design?

It is generally designed for folding carton board. Using a micro-flute corrugated board is possible but requires careful adjustment of the front locking slit and tuck tongue to account for the extra thickness.

Shipping and Route

Is this box safe to ship in the mail?

The friction-fit tuck tongue and glueless walls are designed for retail display or direct hand-off. For parcel shipping, this carton usually needs to be placed inside a protective outer corrugated shipper.

Product Fit

Is this box food safe for bakery slices?

The structure itself is well-suited for slices, but food safety depends entirely on the board and coating specified. You should request a food-contact barrier coating if packing greasy or moist items directly.

Modifications

Can the size of the rounded corners be changed?

Yes, the corner radii can be adjusted. However, changing the front corner radius requires verifying that the side walls still interlock correctly to form the locking slit.

Can a window be added to the lid?

Yes, a display window can be cut into the lid. The size of the window should leave enough border material to keep the lid rigid and support the front tuck tongue.

Assembly and Packing

How does the front lock stay closed?

The front tuck tongue inserts into a slit created where the two side walls interlock. It relies on friction and the stiffness of the board to stay closed during normal retail handling.