Rock Bags
Rock does something gravel does not: it punctures. These bags are specified for sharp, angular material — heavier fabric, reinforced corners and construction chosen to survive the load rather than just carry it.
Specified for sharp material
Most bulk bag failures with rock are not overload failures. They are punctures — one angular face under full load opens the fabric and the tear propagates from there.
That is a different specification problem from carrying weight. It is solved with fabric weight, weave density and reinforcement where the rock actually contacts the bag, which is the corners and the lower sidewall.
Placement changes the spec
A bag that will be emptied needs a discharge design. A bag that will be set in place and left — erosion control, bank stabilisation, a temporary barrier — needs a closed bottom and loop construction rated for repeated lifting at full weight.
Tell us which one you are doing. It is the single biggest factor in what we quote.