diff --git a/source/mijin/container/typeless_buffer.hpp b/source/mijin/container/typeless_buffer.hpp
index 4ce0acb..92752d5 100644
--- a/source/mijin/container/typeless_buffer.hpp
+++ b/source/mijin/container/typeless_buffer.hpp
@@ -37,9 +37,12 @@ public:
 private:
     std::vector<std::byte> bytes_;
 public:
+    auto operator<=>(const TypelessBuffer&) const noexcept = default;
+    
     [[nodiscard]] void* data() noexcept { return bytes_.data(); }
     [[nodiscard]] const void* data() const noexcept { return bytes_.data(); }
     [[nodiscard]] size_type byteSize() const noexcept { return bytes_.size(); }
+    [[nodiscard]] size_type byteCapacity() const noexcept { return bytes_.capacity(); }
     [[nodiscard]] bool empty() const noexcept { return bytes_.empty(); }
     void resize(size_type numBytes) { bytes_.resize(numBytes); }
     void reserve(size_type numBytes) { bytes_.reserve(numBytes); }
diff --git a/source/mijin/container/untyped_vector.hpp b/source/mijin/container/untyped_vector.hpp
new file mode 100644
index 0000000..a09a9ed
--- /dev/null
+++ b/source/mijin/container/untyped_vector.hpp
@@ -0,0 +1,91 @@
+
+#pragma once
+
+#if !defined(MIJIN_CONTAINER_UNTYPED_VECTOR_HPP_INCLUDED)
+#define MIJIN_CONTAINER_UNTYPED_VECTOR_HPP_INCLUDED 1
+
+#include <stdexcept>
+#include "./typeless_buffer.hpp"
+
+namespace mijin
+{
+class UntypedVector
+{
+public:
+    using size_type = std::size_t;
+private:
+    std::size_t elementSize_ = 0;
+    TypelessBuffer buffer_;
+public:
+    explicit UntypedVector(size_type elementSize = 0, size_type count = 0) : elementSize_(elementSize)
+    {
+        resize(count);
+    }
+
+    std::span<std::byte> operator[](size_type index)
+    {
+        return at(index);
+    }
+
+    std::span<const std::byte> operator[](size_type index) const
+    {
+        return at(index);
+    }
+    
+    auto operator<=>(const UntypedVector&) const noexcept = default;
+
+    void resize(size_type count)
+    {
+        MIJIN_ASSERT(elementSize_ > 0, "Cannot allocate without element size.");
+        buffer_.resize(count * elementSize_);
+    }
+
+    void reserve(size_type count)
+    {
+        MIJIN_ASSERT(elementSize_ > 0, "Cannot allocate without element size.");
+        buffer_.reserve(count * elementSize_);
+    }
+
+    [[nodiscard]]
+    std::span<std::byte> at(size_type index)
+    {
+        if (index > size())
+        {
+            throw std::out_of_range("Index out of range.");
+        }
+        return buffer_.makeSpan<std::byte>().subspan(index * elementSize_, elementSize_);
+    }
+
+    [[nodiscard]]
+    std::span<const std::byte> at(size_type index) const
+    {
+        if (index > size())
+        {
+            throw std::out_of_range("Index out of range.");
+        }
+        return buffer_.makeSpan<std::byte>().subspan(index * elementSize_, elementSize_);
+    }
+
+    [[nodiscard]]
+    size_type size() const MIJIN_NOEXCEPT
+    {
+        if (elementSize_ == 0)
+        {
+            return 0;
+        }
+        return buffer_.byteSize() / elementSize_;
+    }
+
+    [[nodiscard]]
+    size_type capacity() const MIJIN_NOEXCEPT
+    {
+        if (elementSize_ == 0)
+        {
+            return 0;
+        }
+        return buffer_.byteCapacity() / elementSize_;
+    }
+};
+}
+
+#endif // !defined(MIJIN_CONTAINER_UNTYPED_VECTOR_HPP_INCLUDED)
\ No newline at end of file