No currently produced cold packs from First Aid Only are considered to be ORM-D and unsafe for aviation travel.
Older models of cold packs contained a formula that was considered hazardous in large quantities, and therefore marked with the ORM-D label.
To verify if your older cold pack was apart of this old makeup, please refer to the ingredients list on the cold pack. If the ingredients listed are "water" and "urea" than it is a non hazardous item and not ORM-D. If the ingredients vary from these two components, than the cold pack is considered ORM-D.