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RSC vs HSC vs FOL Boxes: Which Style Fits Your Shipment

Most corrugated shipping boxes fall into three styles: RSC, HSC and FOL. The names refer to how the flaps are cut and how they close. This guide explains each one, when it makes sense, and what to ask before you order.

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The short answer: start with RSC

A regular slotted container, or RSC, is today's most common box design. It has four flaps on the top and four on the bottom. When you fold it closed, the outer flaps meet at the center and the box is sealed with tape. If you are shipping a general product and have no unusual packing needs, an RSC is the default choice for a reason.

Because every flap is the same length as half the box width, an RSC is simple to make in volume and simple to pack by hand. Warehouses, eCommerce shippers and manufacturers all stock a range of RSC sizes for that reason.

What an HSC changes

A half slotted container, or HSC, is similar to an RSC but has no top flaps. Only the bottom is slotted. That makes it an open-top box, which suits products that are loaded from above or boxes that get a separate lid, cover or sheet on top.

HSC boxes are common where a product needs to be seen, counted or reached quickly, and where a cover goes on later. They also work when a box will be packed on a line that drops the product in from above and closes it with a separate part.

Where FOL boxes fit

A full overlap box, or FOL, has flaps that are long enough to cover the full width of the box rather than meeting in the middle. The overlap adds a second layer of board across the top and bottom. Buyers often choose it when a box will be stacked or carry a heavier load, because the doubled panel gives the closed box more rigidity.

The trade-off is material. Longer flaps use more board, so a FOL costs more to make than an RSC of the same size. Ask whether the extra strength is actually needed, or whether a stronger board grade on a plain RSC would do the job.

Board grade matters as much as box style

Style is only half of the decision. The corrugated board itself comes in single wall, double wall and triple wall, and each step up adds layers and strength. A heavy or dense product in a single wall box can fail even if the style is right, while a light product in triple wall is paying for strength it does not use.

Board also has a rating that describes how well it resists crushing along its edges, usually called edge crush test, or ECT. When you ask for a quote, give the supplier the product weight and how high the boxes will be stacked, and let them recommend a grade. It is a quick question that avoids both underbuilt and overbuilt boxes.

If you ship by courier or by pallet, mention that as well. Boxes that travel on a pallet are stacked and strapped, which asks different things from the board than a single parcel.

Questions to ask before you pick a style

Start with the product. How heavy is it, does it have sharp edges, and does it need to sit still inside the box? A box that holds a loose, light item has different needs from one that carries a dense part.

Then look at the pack-out. Who fills the box, how fast, and from which direction? If the answer is hand-packing from the top, an HSC with a lid may save steps. If the box goes through a taping machine, an RSC is the usual fit.

Finally, think about the route. Boxes that get stacked on pallets, held in storage or handled many times need more than boxes that go straight from your dock to a customer. Mention that in your quote request so the board grade and style are chosen together.

When none of the three fits

Some products simply do not suit a standard slotted box. Odd shapes, fragile contents and retail packaging often call for a custom structure, a diecut insert, or a box designed to double as a display. A supplier with in-house structural design can build a sample and test the folds before any printing starts.

Flint Packaging makes standard RSC, HSC and FOL boxes as well as custom and diecut packaging. If you are not sure which style your product needs, send the dimensions and a description of how it ships, and the team can recommend one.