Class that stores the item

 public class LoadoutItem
        {
            public int itemid;
            public bool bp;
            public int skinid;
            public string container;
            public int slot;
            public int amount;

            public LoadoutItem()
            {
            }

            [JsonConstructor]
            public LoadoutItem(int pitemid, bool pbp, int pskinid, string pcontainer, int pamount, int pslot)
            {
                itemid = pitemid;
                pbp = bp;
                skinid = pskinid;
                container = pcontainer;
                amount = pamount;
                slot = pslot;
            }
        }​

Methode that saves the item to class.

//Sets inventory of the player.
        List<LoadoutItem> set_loadout(BasePlayer player)
        {
            var loadoutitems = player.inventory.containerWear.itemList.Select(item => new LoadoutItem
            {
                itemid = item.info.itemid,
                bp = item.IsBlueprint(),
                container = "wear",
                amount = item.amount,
                skinid = Convert.ToInt32(item.skin),
                slot = item.position
            }).ToList();
            
            loadoutitems.AddRange(player.inventory.containerMain.itemList.Select(item => new LoadoutItem
            {
                itemid = item.info.itemid,
                bp = item.IsBlueprint(),
                container = "main",
                amount = item.amount,               
                skinid = Convert.ToInt32(item.skin),
                slot = item.position
            }));
            loadoutitems.AddRange(player.inventory.containerBelt.itemList.Select(item => new LoadoutItem
            {
                itemid = item.info.itemid,
                bp = item.IsBlueprint(),
                container = "belt",
                amount = item.amount,
                skinid = Convert.ToInt32(item.skin),
                slot = item.position

            }));
            return loadoutitems;
        }​