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ECMA A55.20.01.03

Snap-Lock Bottom Carton with Tuck Top

  • 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

  • Straight-line glued side seam
  • Interlocking 4-flap base supports medium weights
  • Delivered flat for manual assembly

About this product

This folding carton combines a classic tuck-in top with a self-locking envelope base, commonly known as a 1-2-3 or snap-lock bottom. The four bottom flaps interlock mechanically to form a secure floor without requiring glue at the base.

Because it only requires a single glued side seam, it uses a simpler manufacturing process than pre-glued bases. The trade-off is at the packing station: the interlocking base must be folded together by hand, making it a practical choice for manual fulfillment lines where straight-line gluing is preferred over absolute packing speed.

Common uses

  • Cosmetics and skincare
  • Pharmaceuticals and supplements
  • Lightweight hardware or parts

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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Practical Retail and Kitting Uses

Cosmetics and personal care

The clean top closure and flat display panels make this a standard choice for bottles, tubes, and jars. The interlocking base easily supports the weight of typical skincare products.

Pharmaceuticals and supplements

Provides a secure enclosure for pill bottles or blister packs. The top tuck can be fitted with slit locks to prevent accidental opening on retail shelves.

Lightweight hardware and parts

Offers more base security than a standard tuck carton, preventing heavier small parts from slipping out the bottom during handling.

Specialty foods and confections

A practical format for tall bottles, bagged treats, or lightweight dry goods that need a flat, stable base for retail display.

Typical Packing Environments

Manual fulfillment operations

If your team packs by hand, this carton balances material use with a straightforward folding sequence. Operators quickly learn the 1-2-3 folding rhythm.

Retail display

The flat, unglued bottom panels sit cleanly on store shelves, while the main panels provide uninterrupted space for high-quality graphics and branding.

Kitting and multi-component packing

When operators pack multiple items into a single carton, the snap-lock base provides a stable floor that resists opening during the loading process.

When to Consider a Different Base Style

High-speed or automated packing

If you are running automated cartoning equipment or need to maximize manual packing speed, look at a crash-lock (auto-bottom) carton. Crash-locks require multi-point gluing but snap open instantly.

Very light products

If the product is extremely light and base security is not a primary concern, a standard reverse or straight tuck carton simplifies the blank and slightly speeds up hand assembly.

Heavy or fragile items

For heavy items that might push through an unglued mechanical lock, consider a fully glued crash-lock base or a corrugated format.

Key Choices for Fit and Function

Board grade and thickness

The snap-lock base relies on precise friction and interlocking catches. Changing the board thickness requires adjusting the lock clearances so the flaps do not bind or slip.

Top closure security

Decide if the top tuck flap needs slit locks (small notches that catch on the dust flaps) for extra security, or a simple friction fit for easier repeated opening.

Outer shipping requirements

This is a primary retail carton. It requires a corrugated outer shipper for parcel or pallet transit.

Packing line setup

Evaluate whether your packing line is fully manual or automated. The multi-step folding sequence of the snap-lock base is suited for hand packing, while automated lines typically require a pre-glued base.

Modifying the Base and Closure

Slit lock depth

The notches on the top tuck flap can be deepened for a tighter hold or removed entirely for a smoother opening experience.

Dust flap clearance

The side dust flaps can be adjusted to prevent binding against the top cover, especially when using thicker paperboard.

Tuck flap length

The insertion depth of the top tuck flap can be extended for heavier products or shortened for easier access.

Board and packing details

Assembly sequence

Operators typically pop the flat tube open, fold the large U-shaped bottom flap first, fold the two side flaps over it, and finally push the tabbed locking flap into the center catch.

Grain direction

For the best vertical stacking strength and clean folds, the paperboard grain should typically run horizontally around the tube.

Template Variants

A55.20.01.03.a

A highly parametric variant that automatically adjusts panel heights and tuck flap dimensions based on the exact material thickness, ensuring a precise fit when changing board grades.

Additional notes

Top tuck slit locks

The top tuck flap can include small notches (slit locks) that catch on the side dust flaps. This makes the carton harder to open accidentally on a retail shelf, though it requires slightly more effort from the consumer.

Related Carton Styles

A55.30.01.03: Scissor Lock Top Carton

An alternative if you need a different top closure style while keeping the same snap-lock base.

FAQs

Assembly and Labor

What is the difference between a snap-lock and a crash-lock bottom?

A snap-lock (or 1-2-3) bottom has four unglued flaps that the packer must fold and interlock by hand. A crash-lock (auto-bottom) is pre-glued at the factory and snaps into place automatically when the box is opened. Snap-locks use simpler straight-line gluing, while crash-locks speed up the packing line.

Product Fit

How much weight can a snap-lock bottom hold?

It easily supports lightweight to medium-weight retail goods like cosmetics, supplements, and small parts. Because the base is held together by mechanical friction rather than glue, very heavy items can cause the bottom to bulge or open. We recommend testing a physical sample with your exact product.

Manufacturing and Route

Can this carton be erected on automated packaging lines?

Usually not. The multi-step folding sequence required to lock the bottom flaps is designed for manual assembly. Automated lines typically require a pre-glued crash-lock base or a different carton style.

Closure and Security

Does the bottom need to be taped or glued?

No. The four bottom flaps are cut to interlock securely without tape or glue. The side seam of the carton is glued by the manufacturer before it is delivered to you.

Material and Board

Can I use a thick micro-flute corrugated board for this style?

It is possible, but it requires careful adjustment. The snap-lock catches rely on specific clearances. If the board is too thick, the flaps may bind and refuse to lock flat. It is generally suited for standard folding boxboard (FBB) or solid bleached sulfate (SBS).

Shipping

Is this box safe to ship in the mail on its own?

No. This is a primary retail carton. The friction-fit top and interlocking bottom can open if dropped or crushed during transit. It should be packed inside a corrugated master shipper or mailer for parcel delivery.

Customization

Can a window patch be added to this carton?

Yes, a window patch can be added to the main panels to display the product. The cutout must be kept away from the creases and the snap-lock base to maintain the carton's structural strength.

Material and Board

Why does grain direction matter for this carton?

For the best vertical stacking strength and clean folds, the paperboard grain should typically run horizontally around the tube. This prevents the main panels from bowing and ensures the snap-lock flaps fold crisply.