diff --git a/packages/bytes-wasm-crypto/package.json b/packages/bytes-wasm-crypto/package.json
index 8201ce0e..63bdfd35 100644
--- a/packages/bytes-wasm-crypto/package.json
+++ b/packages/bytes-wasm-crypto/package.json
@@ -12,6 +12,7 @@
   "bugs": "https://github.com/polkadot-js/wasm/issues",
   "homepage": "https://github.com/polkadot-js/wasm",
   "dependencies": {
-    "@babel/runtime": "^7.12.5"
+    "@babel/runtime": "^7.12.5",
+    "fflate": "^0.4.2"
   }
 }
diff --git a/packages/bytes-wasm-crypto/src/buffer.ts b/packages/bytes-wasm-crypto/src/buffer.ts
new file mode 100644
index 00000000..9d35e564
--- /dev/null
+++ b/packages/bytes-wasm-crypto/src/buffer.ts
@@ -0,0 +1,4 @@
+// Copyright 2017-2020 @polkadot/bytes-wasm-crypto authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+export const buffer = Buffer.from([]);
diff --git a/packages/bytes-wasm-crypto/src/data.ts b/packages/bytes-wasm-crypto/src/data.ts
index b86ce514..0cc5f3b1 100644
--- a/packages/bytes-wasm-crypto/src/data.ts
+++ b/packages/bytes-wasm-crypto/src/data.ts
@@ -1,4 +1,8 @@
 // Copyright 2017-2020 @polkadot/bytes-wasm-crypto authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-export const wasmBytes = null;
+import { unzlibSync } from 'fflate';
+
+import { buffer } from './buffer';
+
+export const wasmBytes = unzlibSync(buffer);
diff --git a/packages/wasm-crypto/package.json b/packages/wasm-crypto/package.json
index 12b26081..cd68ff0d 100644
--- a/packages/wasm-crypto/package.json
+++ b/packages/wasm-crypto/package.json
@@ -10,8 +10,8 @@
   },
   "devDependencies": {
     "@polkadot/dev": "^0.60.29",
-    "@polkadot/util": "^4.2.2-14",
-    "@polkadot/x-randomvalues": "^4.2.2-14",
+    "@polkadot/util": "^4.2.2-15",
+    "@polkadot/x-randomvalues": "^4.2.2-15",
     "override-require": "^1.1.1"
   },
   "peerDependencies": {
diff --git a/scripts/pack-wasm-base.js b/scripts/pack-wasm-base.js
index 31dd735f..0df02ce6 100755
--- a/scripts/pack-wasm-base.js
+++ b/scripts/pack-wasm-base.js
@@ -2,24 +2,43 @@
 // SPDX-License-Identifier: Apache-2.0
 
 const fs = require('fs');
+const { formatNumber } = require('@polkadot/util');
 
 const A_NAME = 'bytes-asmjs-crypto';
 const W_NAME = 'bytes-wasm-crypto';
 
-const hdr = (package) => `// Copyright 2019-2020 @polkadot/${package} authors & contributors
+function hdr (package) {
+  return `// Copyright 2019-2020 @polkadot/${package} authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 // Generated as part of the build, do not edit
 `;
+}
+
+// only one of the deps are included, here are the details for package.json -
+//   "fflate": "^0.4.2"
+//   "lz4js": "^0.2.0"
+function getWasmBuffer (lib = 'fflate') {
+  const data = fs.readFileSync('./bytes/wasm_opt.wasm');
+  const comp = lib === 'fflate'
+    ? Buffer.from(require('fflate').zlibSync(data, { level: 9 }))
+    : Buffer.from(require('lz4js').compress(data));
+
+  console.log(`*** Compressed WASM via ${lib}: ${formatNumber(data.length)} -> ${formatNumber(comp.length)} (${(100 * comp.length / data.length).toFixed(2)}%)`);
+
+  return comp.toString('base64');
+}
 
 fs.writeFileSync(`./${A_NAME}/build/data.mjs`, `${hdr(A_NAME)}
 export { asmJsInit } from './data.js';
 `);
 
-fs.writeFileSync(`./${W_NAME}/build/data.mjs`, `${hdr(W_NAME)}
-export { wasmBytes } from './data.js';
+fs.writeFileSync(`./${W_NAME}/build/buffer.mjs`, `${hdr(W_NAME)}
+export { buffer } from './buffer.js';
 `);
 
-fs.writeFileSync('./bytes-wasm-crypto/build/data.js', `${hdr(W_NAME)}
-module.exports = { wasmBytes: Buffer.from('${fs.readFileSync('./bytes/wasm_opt.wasm').toString('base64')}', 'base64') };
+fs.writeFileSync('./bytes-wasm-crypto/build/buffer.js', `${hdr(W_NAME)}
+const buffer = Buffer.from('${getWasmBuffer()}', 'base64');
+
+module.exports = { buffer };
 `);
diff --git a/yarn.lock b/yarn.lock
index 3c98c48a..85c12ea2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1699,6 +1699,7 @@ __metadata:
   resolution: "@polkadot/bytes-wasm-crypto@workspace:packages/bytes-wasm-crypto"
   dependencies:
     "@babel/runtime": ^7.12.5
+    fflate: ^0.4.2
   languageName: unknown
   linkType: soft
 
@@ -1796,18 +1797,18 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot/util@npm:^4.2.2-14":
-  version: 4.2.2-14
-  resolution: "@polkadot/util@npm:4.2.2-14"
+"@polkadot/util@npm:^4.2.2-15":
+  version: 4.2.2-15
+  resolution: "@polkadot/util@npm:4.2.2-15"
   dependencies:
     "@babel/runtime": ^7.12.5
-    "@polkadot/x-textdecoder": 4.2.2-14
-    "@polkadot/x-textencoder": 4.2.2-14
+    "@polkadot/x-textdecoder": 4.2.2-15
+    "@polkadot/x-textencoder": 4.2.2-15
     "@types/bn.js": ^4.11.6
     bn.js: ^4.11.9
     camelcase: ^5.3.1
     ip-regex: ^4.2.0
-  checksum: bfe13736649b08eb08dbc6cf4a312ef13d6baf179755ecf918cc4b20ed673a551a4e0e0c95a641745a4627d14101c27759247d9f06878457f9cc4d8000a6eb70
+  checksum: 268630b60794bcaf6626ba3aee209f7418fecf1417cd985a18cbc25ec0d692a63344cb67f6aaeca395a9ad2fa6e175eed1de921123c20a45ff78e299e5b92041
   languageName: node
   linkType: hard
 
@@ -1819,8 +1820,8 @@ __metadata:
     "@polkadot/bytes-asmjs-crypto": ^2.0.2-15
     "@polkadot/bytes-wasm-crypto": ^2.0.2-15
     "@polkadot/dev": ^0.60.29
-    "@polkadot/util": ^4.2.2-14
-    "@polkadot/x-randomvalues": ^4.2.2-14
+    "@polkadot/util": ^4.2.2-15
+    "@polkadot/x-randomvalues": ^4.2.2-15
     override-require: ^1.1.1
   peerDependencies:
     "@polkadot/util": "*"
@@ -1828,30 +1829,30 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@polkadot/x-randomvalues@npm:^4.2.2-14":
-  version: 4.2.2-14
-  resolution: "@polkadot/x-randomvalues@npm:4.2.2-14"
+"@polkadot/x-randomvalues@npm:^4.2.2-15":
+  version: 4.2.2-15
+  resolution: "@polkadot/x-randomvalues@npm:4.2.2-15"
   dependencies:
     "@babel/runtime": ^7.12.5
-  checksum: b8beaf8371334237607832d6e5e19291c03afcf533fff9ddd6e218e51d94273de5b534afd5b57eca31795165b3771f4f308299391299807f833bbce50776f323
+  checksum: 2dcde33e485f6b5f01164d926a31871569f53d31ce9c9a374c99883b142942b127b6bf2050d5b22104af6c1493ff0bdb99bae941644225c7bb718a39c8f43096
   languageName: node
   linkType: hard
 
-"@polkadot/x-textdecoder@npm:4.2.2-14":
-  version: 4.2.2-14
-  resolution: "@polkadot/x-textdecoder@npm:4.2.2-14"
+"@polkadot/x-textdecoder@npm:4.2.2-15":
+  version: 4.2.2-15
+  resolution: "@polkadot/x-textdecoder@npm:4.2.2-15"
   dependencies:
     "@babel/runtime": ^7.12.5
-  checksum: 0516ef3abd8e04fe964f6d2aa95a09c80f9f6d8b3d1a62b9df2aae004393c1660ec5d18ce8be23f61043d0cc9903920731b598d5dd1c49f9f1be8d9ee955684f
+  checksum: 613e253033947c0049798302226d68941b4cf6a3cd60372766578d13ece7b319d93ddd69e7179f49461031ba0bbed8fc93126157e2cc95afbb5b107c80822e3c
   languageName: node
   linkType: hard
 
-"@polkadot/x-textencoder@npm:4.2.2-14":
-  version: 4.2.2-14
-  resolution: "@polkadot/x-textencoder@npm:4.2.2-14"
+"@polkadot/x-textencoder@npm:4.2.2-15":
+  version: 4.2.2-15
+  resolution: "@polkadot/x-textencoder@npm:4.2.2-15"
   dependencies:
     "@babel/runtime": ^7.12.5
-  checksum: 2d9c66b1e6e5e5ceb06c552f48f51bb38e881a77a7134a08ab2d725ab42612964234564064d6fb1d47de6d831469b23f9af3662a18867fe4c50cbd9258279c08
+  checksum: a7541e899be2375b4cb1913896e7acbc774fcd891947c53d540afd8ebfcca2216c8f31a84e428d88506dda5325369584b7b7e32559b0e6b91e34644884fc0a2c
   languageName: node
   linkType: hard
 
@@ -4456,6 +4457,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"fflate@npm:^0.4.2":
+  version: 0.4.2
+  resolution: "fflate@npm:0.4.2"
+  checksum: e96c19a1d514f74faa1fe320c022aaf1dade597150510da18dce024ff5a2fa0b6e103daf828fac26c54b647777256638fc7106a3dcff078572b8dee73071df54
+  languageName: node
+  linkType: hard
+
 "figures@npm:^3.0.0":
   version: 3.2.0
   resolution: "figures@npm:3.2.0"