//ModelCollection.cs in models

using System;
using System.Collections.Generic;

namespace ModelContainer
{
   public class ModelCollection
   {
       private Dictionary<Type, object> models = new Dictionary<Type, object>();

       public void AddModel<T>(T t)
       {
           models.Add(t.GetType(), t);
       }

       public T GetModel<T>()
       {
           return (T)models[typeof(T)];
       }
   }
}

//Controller:
public class SampleController : Controller
{

   ModelCollection modelCollection = new ModelCollection();
    public ActionResult Index()
    {
       var model1 = new Model1();
       var model2 = new Model2();
       var model3 = new Model3();

       // Do something

       modelCollection.AddModel(model1);
       modelCollection.AddModel(model2);
       modelCollection.AddModel(model3);
       return View(modelCollection);
  }

    public ActionResult SaveModels(ModelCollection modelCollection)
    {
     //code here
     modelCollection is empty, why???

    }

//The View:
@using Models
@model ModelCollection

@{
     ViewBag.Title = "Model1: " + ((Model.GetModel<Model1>()).Name);
 }

 <h2>Model2: @((Model.GetModel<Model2>()).Number</h2>

  @((Model.GetModel<Model3>()).SomeProperty