diff --git a/bench/_helpers.js b/bench/_helpers.js
index cd96f5a4..abd637ec 100644
--- a/bench/_helpers.js
+++ b/bench/_helpers.js
@@ -6,6 +6,8 @@ function truncate (num) {
   return `${bits[0]}.${bits[1].substring(0, 2)}`
 }
 
+let roundHalf = num =>  Math.round(num * 2) / 2
+
 function formatSize (num) {
   // Measure in KB
   if (num < MB) return `${truncate(num / KB)} KB`
@@ -20,4 +22,4 @@ let names = {
   'aws-sdk-v3': 'AWS SDK v3',
 }
 
-module.exports = { formatSize, names }
+module.exports = { formatSize, names, roundHalf }
diff --git a/bench/benchmark-size.js b/bench/benchmark-size.js
index 7cab54a7..9f4768c4 100755
--- a/bench/benchmark-size.js
+++ b/bench/benchmark-size.js
@@ -1,34 +1,97 @@
 #! /usr/bin/env node
-let { mkdirSync, statSync } = require('fs')
+let { mkdirSync, rmSync, statSync, writeFileSync } = require('fs')
 let { join } = require('path')
+let { execSync }  = require('child_process')
 let { build } = require('esbuild')
+let folderSize = require('fast-folder-size/sync')
+
 // eslint-disable-next-line
-let { formatSize, names } = require('./_helpers')
+let { formatSize, names, roundHalf } = require('./_helpers')
+
+let installCommands = {
+  'aws-lite': '@aws-lite/client', // TODO: install '@aws-lite/dynamodb' when ready!
+  'aws-sdk-v2': 'aws-sdk',
+  'aws-sdk-v2-client': null,
+  'aws-sdk-v3': '@aws-sdk/client-dynamodb',
+}
+
+let awsLiteUnbundledSize
+let awsLiteBundledSize
+let v2installTime
+let v2size
 
 async function main () {
-  // TODO: run unbundled size on disk benchmarks
   console.log(`---------- Running bundle size benchmarks ---------- `)
   let entryFileFolder = join(__dirname, 'entry-files')
-  for (let entry of Object.keys(names)) {
-    let name = entry.split('.js')[0]
-    let friendlyName = names[name]
-    console.log(`[${friendlyName}]`)
+  for (let [ name, friendly ] of Object.entries(names)) {
+    let isAWSLite = name === 'aws-lite'
+    let time, unbundledSize, bundledSize
+
+    console.log(`[${friendly}]`)
+
+    /**
+     * Install
+     */
+    if (name !== 'aws-sdk-v2-client') {
+      let startInstall = Date.now()
+      let installDir = join(__dirname, 'tmp', name + '-install')
+      rmSync(installDir, { recursive: true, force: true })
+      mkdirSync(installDir, { recursive: true })
+
+      // Stub in a package.json
+      writeFileSync(join(installDir, 'package.json'), '{}')
+
+      console.log(`Installing ${installCommands[name]}...`)
+      let cmd = `npm i --omit=dev ${installCommands[name]}`
+      try {
+        execSync(cmd, { cwd: installDir, stdio: [] })
+      }
+      catch (err) {
+        console.log(`Installation error`, err)
+      }
+
+      unbundledSize = folderSize(join(installDir, 'node_modules'))
+      time = Date.now() - startInstall
 
-    let outDir = join(__dirname, 'tmp', name)
-    mkdirSync(outDir, { recursive: true })
-    let outfile = join(outDir, entry)
+      if (isAWSLite) {
+        awsLiteUnbundledSize = unbundledSize
+      }
+      if (name === 'aws-sdk-v2') {
+        v2size = unbundledSize
+      }
+      console.log(`- Installation time: ${time} ms`)
+    }
+    else {
+      unbundledSize = v2size
+      console.log(`- Installation time: ${v2installTime} ms`)
+    }
+    let larger = ''
+    if (!isAWSLite) larger = ` (${roundHalf(unbundledSize / awsLiteUnbundledSize)}x larger)`
+    console.log(`- Unbundled size: ${formatSize(unbundledSize)}${larger}`)
 
-    let start = Date.now()
+    /**
+     * Bundle
+     */
+    let bundleDir = join(__dirname, 'tmp', name + '-bundle')
+    mkdirSync(bundleDir, { recursive: true })
+    let outfile = join(bundleDir, `${name}-bundle.js`)
     await build({
-      entryPoints: [ join(entryFileFolder, entry) ],
+      entryPoints: [ join(entryFileFolder, `${name}.js`) ],
       bundle: true,
       platform: 'node',
       format: 'cjs',
       outfile,
     })
-    console.log(`esbuild completed bundling in ${Date.now() - start} ms`)
-    let { size } = statSync(outfile)
-    console.log(`Bundle size: ${formatSize(size)}`)
+    let stat = statSync(outfile)
+    bundledSize = stat.size
+    if (isAWSLite) {
+      awsLiteBundledSize = bundledSize
+      larger = ''
+    }
+    else {
+      larger = ` (${roundHalf(bundledSize / awsLiteBundledSize)}x larger)`
+    }
+    console.log(`- Bundled size: ${formatSize(bundledSize)}${larger}`)
     console.log('')
   }
 }
diff --git a/bench/package.json b/bench/package.json
index dec371f2..01fa6073 100644
--- a/bench/package.json
+++ b/bench/package.json
@@ -8,6 +8,7 @@
     "@aws-sdk/client-dynamodb": "^3.413.0",
     "aws-sdk": "^2.1458.0",
     "esbuild": "^0.19.0",
+    "fast-folder-size": "^2.2.0",
     "percentile": "^1.6.0"
   }
 }