User Guide | Big bag with spout top and flat bottom
The big bag with spout sleeve and flat bottom solves a specific problem in outdoor bulk handling: you need the wide opening of an open-mouth bag, but also the ability to close the container against rain, wind or ambient dust once filled. This guide explains how to deploy the sleeve, fill the bag with loaders or wide hoppers, tie it correctly and move the load with the operational safety that its 5:1 factor guarantees.
The procedure described applies to the only available version of the product, of 1500 kg and dimensions 90 × 90 × 110 cm. Read it in full before the first load: the critical point of this format is not the filling or the lifting, but the correct closing of the sleeve, a one-minute operation that decides whether your bag withstands rain or not.
Product specifications
The big bag with spout sleeve and flat bottom is offered in a single version. The following table lists the complete technical specifications of the only available variant:
| Specification | Value |
|---|---|
| SKU | 532346 |
| Material | Woven virgin polypropylene |
| Dimensions | 90 × 90 × 110 cm (3 × 3 × 3.6 ft) |
| Load capacity | 1500 kg (3300 lb) |
| Safety factor | 5:1 |
| Inner liner | No |
| Filling spout | Sleeve or skirt (extensible top flap) |
| Base shape | Flat bottom |
| Lifting loops | 4 reinforced corner loops |
| Treatment | UV resistance |
| Packaging | Pack of 30 big bags |
If you work with several big bag formats at once, the sister guides may interest you: the one for the big bag with open mouth and flat bottom (the version without skirt) and the one for the big bag with filling valve and flat bottom (format for closed in-plant processes).
Step-by-step use
The following procedure covers the complete cycle from initial inspection to lifting the filled and closed load. The critical step is the fourth: the correct closing of the sleeve is what defines whether this bag really protects the contents or becomes an expensive open-mouth bag.
Inspection of seams and the sleeve join
Check the four loops, the seams of the base and, with special attention, the join between the body of the bag and the upper sleeve. This is the zone of greatest tension when filling in bulk and the first to fail in budget bags. Confirm that there are no loose threads or stitched points that give way under the hand. If you detect any defect in the sleeve, do not use that bag for maximum payload.
Positioning on the pallet with the sleeve deployed
Place the bag on a 1.0 × 1.2 m pallet with the four loops extended upward. Unfold the sleeve by pushing it fully outward to create a wide, rigid mouth. If you are going to fill with loaders or bulky material, it is advisable to provisionally tie the tips of the sleeve to the loops so it does not fall during filling.
Bulk filling through the full opening
Load the bag with loaders, conveyor belts or wide-mouth hoppers. The sleeve allows the passage of bulky, irregular or high-discharge-speed material without jamming. Fill until the contents reach the lower line of the sleeve, leaving between 15 and 25 cm of free fabric to be able to close it. Do not fill to the top: you need that slack for the final knot.
Closing the sleeve against rain and dust
Gather the sleeve inward by pinching the fabric at four opposite points, forming a cross of folds. Tie with industrial rope in a double knot at the top of the skirt, tightening well so that the closure is sealed against dust and surface water. A well-tied sleeve protects the contents during several days of outdoor exposure in a Caribbean climate.
When you tie the sleeve, always leave a surplus of 30 to 40 cm of free rope after the knot. In export or agricultural-yard operations it is common to have to open and re-close the bag to inspect contents, add samples or balance weight between batches. A short rope forces you to cut and replace it each time; a rope with slack saves you time and lets you reuse the same tie throughout the bag's entire cycle.
Lifting and transport with the four loops
Pass the crane hooks, the boom arms or the forklift tines through the four loops simultaneously. Lift in a plumb manner, avoiding lateral jerks that concentrate tension on a single seam. For yard storage, stack a maximum of two filled bags per column; the flat bottom allows it, but going beyond two compromises stability under wind or rain.
Do not fill the bag until the sleeve is completely covered. If the contents rise to the height of the skirt, there will not be enough free fabric to make the knot, and a forced closure or a knot flush with the material ends up coming unstitched during the first lift. Always leave between 15 and 25 cm of free sleeve above the load level.
Complementary products
To complement the use of the big bag with sleeve, the following products cover the most common adjacent needs in outdoor operations and in agricultural or construction yards:
The open-mouth big bag is the sister format without sleeve: use it when the bag will not remain outdoors and you need maximum filling speed. The big bag with filling valve is the closed alternative for in-plant processes where rain is not a factor but cleanliness of packaging is. The manual transparent stretch film adds an additional layer of protection if the filled bag is going to be in transit for several days or is moved on an open platform. The plastic corner protectors protect the corners of the pallet in export operations where the assembly is secured with strapping.
Maintenance and care
The big bag with sleeve can be reused several times if handled with care. After emptying the bag, shake out the material remains through the sleeve opening, fold the bag with the skirt inward and store it in a dry, ventilated place without prolonged exposure to direct sun. UV-treated polypropylene resists Caribbean radiation, but prolonged storage in the sun shortens the service life of even the most resistant fabric.
Before each new load, repeat the inspection from step 1: the sleeve-body join is the zone of greatest wear due to repeated folding and tying. If you detect loose stitching points at that join, discard the bag for maximum load and reassign it to less demanding uses (for example, static storage instead of crane transport).
Frequently asked questions (FAQ)
What is the real difference between this sleeve format and the normal open-mouth big bag?
The big bag with sleeve allows you to close the bag once filled, which protects the contents against rain, wind and ambient dust. The open-mouth one does not close: the contents remain exposed. If your bag is going to remain outdoors for hours or days, or if the material is sensitive to surface moisture, the sleeve makes the difference. If the bag is filled, loaded and unloaded within minutes in the same enclosure, the open-mouth one is faster and more economical.
Is the rope for tying the sleeve included with the bag?
This is a detail that tends to vary depending on the batch and the source. It is advisable to have industrial polypropylene or nylon rope of at least 6 mm in your warehouse before first use. A rope that is too thin digs into the fabric when tightened and does not guarantee a sealed closure; an excessively thick one makes it difficult to make the double knot in the limited space of the sleeve.
Can it withstand heavy tropical rain once correctly closed?
A well-tied sleeve closure resists ambient rain and brief downpours. In prolonged tropical storms, water can seep in by capillary action through the weave of the polypropylene —which is not waterproof, but woven—. For those scenarios, add an additional cover of stretch film or a tarpaulin over the complete pallet. If prolonged exposure to intense rain is common, consider directly a big bag with inner liner.