RSC and FOL boxes: how to choose

For most shipping boxes, the right starting point is the regular slotted container (RSC). A full overlap (FOL) box is worth its extra cost only when the top and bottom of the box need double thickness. Typical cases are boxes kept in tall stacks in storage for long periods, long journeys such as export, and heavy products that give the box no support.

What an RSC is

An RSC is made from one sheet of corrugated board that is slotted and scored (creased) so it folds into a box. The top and bottom flaps meet exactly at the center. Its international code is FEFCO 0201.

That code is what makes quotations comparable. Ask for FEFCO 0201 with internal dimensions and a board specification, and every supplier prices the same box, with no drawings to exchange. The codes come from the European Federation of Corrugated Board Manufacturers (FEFCO) and have four digits: the first two give the structural group, the last two the style within it. Group 02 covers boxes made from a single piece with one joint.

RSC and related box styles compared

Buyers usually weigh the RSC against three other slotted styles and the telescope box. The main differences are flap layout and the amount of board each style uses.

What an FOL adds, and what it costs

An FOL has double thickness at the top and bottom. The extra layer gives clearly better protection against impacts that land directly on either end, and it spreads the load from boxes stacked above more evenly.

Flap length explains the difference. RSC flaps are half the box width deep, so they meet in the middle and leave a single layer of board. FOL flaps run the full width and overlap, which puts two layers at each end.

Those full-width flaps also make an FOL the more expensive box. Each blank needs more board, while an RSC is cut from a plain rectangle with almost no offcut.

How high boxes can be stacked depends mainly on the walls, edges and corners, and these are identical in both styles. Because an FOL strengthens only the ends, it brings a clear gain in top impact protection and a modest gain in stacking height.

If the goal is to stack higher, keep the RSC and move to a stronger flute or paper grade. That usually buys more stacking strength for less money. Corrugated board structure: how E, B, C, BE and BC flutes differ explains the flute options.

When RSC flaps leave a gap

On an RSC that is much longer than it is wide, the inner flaps on the short end panels can leave a gap. These flaps have the same depth as the outer flaps, half the box width, so on a long, narrow box they cannot reach each other. The outer flaps still meet at the center. Buyers often report this gap as a production fault, although it comes from the box proportions.

There are three ways to handle it:

• Switch to an FOL, whose flaps run the full width of the box.
• Change the proportions and make the box wider.
• Accept the gap and seal it with tape, which works well when the product is not sensitive to dust.

How to specify an RSC

Three choices set both the price and the strength of an RSC: internal dimensions, flute and paper grade. They affect each other, so it pays to decide them together.

Internal dimensions

Measure the actual product, add an allowance for board thickness, and give the result as internal dimensions. The product has to fit inside, so the inside measurements are the ones that count.

Flute

• C flute is the standard for general shipping boxes and carries more stacking load than B flute.
• B flute has a smooth, firm surface and good puncture resistance.
• BC flute is a 5-ply board used for export and heavy products.

Paper grade and grammage

The liner grade and its grammage complete the board specification. Corrugated paper grades: what they are and how to choose the right one compares the grades side by side.

Minimum order quantities

• Unprinted RSC: 300 boxes
• Flexo printed: 500 boxes, printed on one side. Other print setups, such as printing inside and outside, are assessed case by case.
• Offset printed, for artwork that needs sharp color: 2,000 boxes

Choosing between RSC and FOL

The choice depends on several factors, and product weight is only one of them:

• How high the boxes are stacked, and for how long
• Whether they are column-stacked with corners aligned, or interlocked
• Storage conditions
• Whether the product carries part of the load itself, as cans and bottles do
• Weight per box

With all of these known, the right specification is usually clear. Custom corrugated boxes shows all the slotted styles and other box structures we produce.

Frequently asked questions

Is an RSC the same as a FEFCO 0201 box?
Yes. RSC stands for regular slotted container, and FEFCO 0201 is its international code.

Why is an RSC cheaper than other box styles?
The blank is a plain rectangle, so there is almost no waste. No cutting die is needed, and the box runs fast on the machine. Both material cost and conversion cost are lower than for die-cut styles.

Do I need to send the design again for a repeat order?
No. The specification of every box we have produced stays on file. Give us the previous job reference, or a photo of the box with its internal dimensions.

How long does production take?
It depends on the type of order. Include your required delivery date in the quotation request so we can check it against these lead times from the start.

• Quotation: 3–5 business days once we have complete information
• New printed box: 10–14 business days from design approval and deposit
• Repeat order with existing tooling: 7–10 business days
• Urgent order: around 3–7 business days, depending on tooling readiness, the machine queue and board supply at the time, so it is confirmed job by job before we accept the order