India Pack Team The Buyer's Guide to FIBC Safety: Understanding Safe Working Load (SWL) When purchasing Flexible Intermediate Bulk Containers (FIBCs), one of the most important specifications you will encounter is the FIBC Safe Working Load (SWL) . It indicates the maximum weight a bag i... Cyclic Test ISO 21898 SF 5:1 SF 6:1 SF 8:1 Safe Working Load