Filling a bulk bag outdoors with the risk of rain, wind, or environmental dust ingress requires a solution halfway between a full opening and a narrow spout. This big bag with a top skirt – also called a skirt top bulk bag, FIBC with a skirt, or bag with an overcover – is manufactured by Fortemo from professional-grade woven polypropylene, with a 5:1 safety factor and an extended fabric top that allows the bag to be closed like a package once filled.
Key Benefits
- Wide opening with secure closure: The skirt unfolds upwards for filling like an open-mouth bag, and is tied or knotted at the end to close the bag against rain, wind, and dust.
- Loading versatility: Compatible with shovels, conveyor belts, wide hoppers, and bulky or irregular materials that won't fit through a narrow spout.
- Warehouse stability: Flat bottom that maintains the bag's cubic shape, facilitating stacking on pallets and organization in the yard.
- UV-treated virgin polypropylene: Fabric manufactured to resist Caribbean solar radiation, making it especially useful when the filled bag remains outdoors for several days before removal.
- Fortemo's meticulous manufacturing: Industrial stitching on handles, base, and skirt joint, the three tension points where an economical bag typically fails first.
Typical Applications and Uses
- Storage of aggregates, rubble, and biomass at open-air construction sites exposed to rain.
- Temporary storage of grains, seeds, and fertilizers in agricultural yards.
- Recycling of heterogeneous materials: light scrap metal, plastics, cardboard, plant biomass.
- Transport of moisture-sensitive products when an inner liner is not required.
Quality and Durability
The skirt is a critical area of the bag: if the joint with the main body is poorly stitched, it will tear with the first strong pull. Fortemo reinforces this seam with a double industrial pass, which distinguishes a premium bag from a generic one that lasts only one or two cycles. For operations where the filled bag needs to withstand unexpected rain, sea wind, or dust-laden environments, this format provides a solution without the need for an inner liner.
The skirt is an extension of the same-width fabric as the sack, that unfolds upward for filling and is then tied up like a parcel. The spout is a narrow tube designed to connect to a hopper. The skirt allows filling with shovels, conveyors and bulk product; the spout is for automated systems with fine powder or grain. They are two formats for different problems, and the choice depends on the type of material and the loading process.
The tied skirt covers the sack mouth and blocks direct entry of rainwater and ambient dust, allowing the sack to be left outdoors for short periods without the contents getting wet. For prolonged storage in a yard during the rainy season, cover the area with a tarp or move it under a roof, since the sack's main fabric is not fully waterproof and humidity can enter by diffusion through the woven polypropylene.
Yes — that is one of the typical uses. The full opening with skirt allows filling with mixed rubble, light scrap, biomass or grouped recycling without jamming at the mouth. The flat bottom supports irregular weight and keeps the sack upright. The only relevant precaution is with materials with very sharp edges (sharp metal scrap, broken glass not pre-bagged), which can puncture the fabric if handling is rough.
The open-mouth model leaves the load exposed once filled, requiring a tarp cover or same-day emptying if it stays outdoors. This model with skirt closes the sack against rain, wind and dust in seconds by tying the skirt, with no external accessories. For sites that delay material removal or agro-industries that fill at end of day, it is the difference between having to come back to the site or not.
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| UV protection | Yes (high) |
|---|---|
| Color | White fabric and black handles |
| Big bag dimensions | 90x90x110 cm (35.4x35.4x43.3 in) |
| Construction type | U-Panel |
| Base type | Flat base |
| Top opening type | Skirt/Duffel |
| Lifting loop type | Cross corner loops, 40 cm (16 in) free length |
| Document pocket | Yes |
| Safety factor (SF) | 5:1 |
| Safe working load (SWL) | 1500 kg (3306.9 lb) |
| Liner | No |
| Package: Width | 110.0 cm (43.31 in) |
|---|---|
| Package: Height | 32.0 cm (12.6 in) |
| Package: Depth | 55.0 cm (21.65 in) |
| Package: Weight | 46.5 kg |
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