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code/Inventory.cs

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+using Sandbox;
+using System;
+using System.Linq;
+
+partial class Inventory : BaseInventory
+{
+	public Inventory( Player player ) : base( player )
+	{
+	}
+
+	public override bool CanAdd( Entity entity )
+	{
+		if ( !entity.IsValid() )
+			return false;
+
+		if ( !base.CanAdd( entity ) )
+			return false;
+
+		return !IsCarryingType( entity.GetType() );
+	}
+
+	public override bool Add( Entity entity, bool makeActive = false )
+	{
+		if ( !entity.IsValid() )
+			return false;
+
+		if ( IsCarryingType( entity.GetType() ) )
+			return false;
+
+		return base.Add( entity, makeActive );
+	}
+
+	public bool IsCarryingType( Type t )
+	{
+		return List.Any( x => x?.GetType() == t );
+	}
+
+	public override bool Drop( Entity ent )
+	{
+		if ( !Host.IsServer )
+			return false;
+
+		if ( !Contains( ent ) )
+			return false;
+
+		ent.OnCarryDrop( Owner );
+
+		return ent.Parent == null;
+	}
+}