On RSA courses we get asked lots of equipment questions, one area which always comes up is about haul bags. So Nate answers:
Basically the bags need to be strong enough to hold the load they will be carrying – this goes back to the LOLER regs, however they should be marked with the SWL, which most bags used in setting are not. So the next step is justifying a deviation – pre-use checks – using the experience of the setters to evaluate the type of bag, condition of the bag and how they are rigged would all be looked at. At the minimum I suggest the bags used be manufactured to carry a similar weight (e.g. rope carry / transport bags are designed to carry rope access equipment so a similar weight in holds is certainly reasonable) they be rigged so not to lose their load unexpectedly, and they be checked before each use and be part of a thorough inspection regime.
In saying all that there are rated bags which have recently come on the market (and bespoke options) however they are rather expensive – but they may be the best option for you or your facility if you have concerns in justifying use of other bags.
Finally, regardless of type of bag, the area under the setter should be cordoned off with an appropriate barrier (for the safety of the public and other staff – considering dropped / bouncing holds) and helmets used as needed.