I know that they are two separate items, but with no planned renewal of the 82 pattern, and the knowledge that the new ruck when fielded is going to the Light Infantry first, the infantry in general, their dismounted support, and that might be about it, as far as I know, the current plan is for everyone else to use the small pack as their "tactical load carriage", and their duffel bag, located in their vehicles, echelon, or rear area as their "strategic load carriage". I have dealt with the new rucks, and they are beyond belief, when all adjusted and fitted to the user, but they are gong to be an incredibly expensive item.