Polypropylene lifting loops are designed for heavy loads. The number of loops depends on how the bags are to be handled. There are a number of different options: bags with "1, 2 or 4 loops.
Choose between an uncoated and coated fabric. Coated fabric is normally used when filling big bags with materials that are not sensitive to moisture but require a coating to prevent material from leaking.
A common and efficient way of filling a big bag is to use a filling spout. With optional discharge spouts in the bottom, you can regulate the emptying volume and speed.
For filling with materials that are sensitive to moisture, you should use a liner. The design of the liner varies, depending on how the big bag is to be filled.