FIBC vs 50 kg PP Woven Bags Compared

When a one-tonne FIBC beats 25 and 50 kg woven sacks and when it does not: handling, filling, container payload and what the receiver can unload.

A flexible intermediate bulk container, the FIBC or jumbo bag, and a 50 kg woven sack are made from the same polymer on the same kind of loom. They answer different questions. The FIBC asks whether both ends of the journey have a forklift or a hoist. The small sack asks whether the last person in the chain will carry the product on a shoulder. Most disputes about pack format are settled by walking through who touches the goods after the factory gate, so this comparison starts there rather than with price per bag.

The two formats side by side

Start with the receiving end

A bulk bag that arrives at a site with no lifting equipment saves nothing. Someone has to cut it open on the truck and shovel a tonne of product into smaller containers, which costs more labour than the bulk format removed. So first establish whether every receiving point on the route has a forklift rated for the load, a way to hang the bag over a hopper, and a floor that takes a tonne on four small feet. Feed mills, resin compounders, mineral processors and large fertilizer blenders usually do. Dealers, farms, building sites and ration shops usually do not, and there the 25 or 50 kg sack remains the only workable unit.

Who buys the product in the end

Cement, fertilizer, rice, sugar and feed are sold onward by the bag in most markets. The sack is the retail unit, the price label and often the brand. A bulk bag cannot be split across a dealer's counter, so a product whose final sale is by the bag has to be in bags at some point, and repacking near the customer is rarely cheaper than packing once at the plant. So our PP woven cement bag and PP laminated fertilizer bag are built for 50 kg, with the fertilizer bag also in 25 kg, while the printed PP woven rice bag runs from 5 kg up to 50 kg for shelves where a smaller pack sells faster.

Packaging weight and cost per tonne

Compare the two per tonne of product, never per bag. A tonne in 50 kg sacks takes twenty bags. At about 90 grams each that is under two kilograms of packaging, similar to the two to three kilograms a one-tonne FIBC weighs. The polymer used is close; what differs is everything around it. Small sacks need a bagging scale and a sewing head, and they need people or a palletiser to stack them. A bulk bag needs a filling frame, pallets or slings, and lifting gear at each transfer. Where labour is cheap and equipment is scarce, small sacks cost less end to end. Where every transfer is mechanised, the bulk bag wins on handling time.

How each one loads a container

A twenty-foot container is limited by weight before volume for dense goods. Loose-stowed 50 kg sacks fill the floor completely and stack to the weight limit the route allows, so the box travels full. Bulk bags leave gaps between round or square bodies and are usually limited to two tiers, which caps a twenty-foot load near twenty one-tonne bags. Palletised small sacks sit between the two. For a dense product on a long sea leg, hand-stowed sacks often carry the most cargo per box; for a product unloaded by machine at destination, the bulk bag turns the container around faster. Coated sacks are smooth and need grip to hold a stack in a moving box, which is what our anti-slip PP woven fabric is made for. Ask the forwarder for the payload the specific road and port limits allow before fixing the format.

Safety is rated differently

An FIBC is a lifting device as well as a package. It carries a safe working load and a safety factor, commonly 5:1 for single-trip and 6:1 for multi-trip bags under ISO 21898, and bulk bags for powders that can ignite are further classed by how they handle static electricity. None of that applies to a small sack, which is never suspended by loops. Its risks are different: the weight one person lifts, and a burst seam when a bag is dropped. Several markets have moved cement and other goods from 50 kg to 25 kg packs for that first reason. A small sack is therefore specified by breaking strength, seam strength and a drop test rather than a safe working load.

Moisture, dust and product protection

Both formats protect a hygroscopic product the same two ways: a coating on the fabric or a polyethylene liner inside it. A small laminated sack has less air trapped with the product and a shorter path for filling dust to escape, and one damaged sack loses 50 kg rather than a tonne. Our PP laminated animal feed bag and PP laminated sugar bag carry a PP coating for that purpose. A bulk bag concentrates risk: a single puncture or a wet patch spoils far more product, so it leans harder on liners and covered storage.

A decision table