diff --git a/src/main/scala/util/HeterogeneousBag.scala b/src/main/scala/util/HeterogeneousBag.scala
new file mode 100644
index 00000000..1aaff08d
--- /dev/null
+++ b/src/main/scala/util/HeterogeneousBag.scala
@@ -0,0 +1,13 @@
+package util
+
+import Chisel._
+import chisel3.core.Record
+import scala.collection.immutable.ListMap
+
+final case class HeterogeneousBag[T <: Data](elts: Seq[T]) extends Record with collection.IndexedSeq[T] {
+  def apply(x: Int) = elts(x)
+  def length = elts.length
+
+  val elements = ListMap(elts.zipWithIndex.map { case (n,i) => (i.toString, n) }:_*)
+  override def cloneType: this.type = (new HeterogeneousBag(elts.map(_.cloneType))).asInstanceOf[this.type]
+}