diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index 822a387..0fa31c7 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -107,7 +107,7 @@
 }
 
 AssetManager2::AssetManager2() {
-  configurations_.resize(1);
+  configurations_.emplace_back();
 }
 
 bool AssetManager2::SetApkAssets(ApkAssetsList apk_assets, bool invalidate_caches) {
@@ -438,8 +438,8 @@
   return false;
 }
 
-void AssetManager2::SetConfigurations(std::vector<ResTable_config> configurations,
-    bool force_refresh) {
+void AssetManager2::SetConfigurations(std::span<const ResTable_config> configurations,
+                                      bool force_refresh) {
   int diff = 0;
   if (force_refresh) {
     diff = -1;
@@ -452,8 +452,10 @@
       }
     }
   }
-  configurations_ = std::move(configurations);
-
+  configurations_.clear();
+  for (auto&& config : configurations) {
+    configurations_.emplace_back(config);
+  }
   if (diff) {
     RebuildFilterList();
     InvalidateCaches(static_cast<uint32_t>(diff));
diff --git a/libs/androidfw/include/androidfw/AssetManager2.h b/libs/androidfw/include/androidfw/AssetManager2.h
index ac46bc5..0fdeefa 100644
--- a/libs/androidfw/include/androidfw/AssetManager2.h
+++ b/libs/androidfw/include/androidfw/AssetManager2.h
@@ -32,6 +32,7 @@
 #include "androidfw/AssetManager.h"
 #include "androidfw/ResourceTypes.h"
 #include "androidfw/Util.h"
+#include "ftl/small_vector.h"
 
 namespace android {
 
@@ -159,9 +160,10 @@
 
   // Sets/resets the configuration for this AssetManager. This will cause all
   // caches that are related to the configuration change to be invalidated.
-  void SetConfigurations(std::vector<ResTable_config> configurations, bool force_refresh = false);
+  void SetConfigurations(std::span<const ResTable_config> configurations,
+                         bool force_refresh = false);
 
-  inline const std::vector<ResTable_config>& GetConfigurations() const {
+  std::span<const ResTable_config> GetConfigurations() const {
     return configurations_;
   }
 
@@ -470,13 +472,13 @@
 
   // An array mapping package ID to index into package_groups. This keeps the lookup fast
   // without taking too much memory.
-  std::array<uint8_t, std::numeric_limits<uint8_t>::max() + 1> package_ids_;
+  std::array<uint8_t, std::numeric_limits<uint8_t>::max() + 1> package_ids_ = {};
 
-  uint32_t default_locale_;
+  uint32_t default_locale_ = 0;
 
   // The current configurations set for this AssetManager. When this changes, cached resources
   // may need to be purged.
-  std::vector<ResTable_config> configurations_;
+  ftl::SmallVector<ResTable_config, 1> configurations_;
 
   // Cached set of bags. These are cached because they can inherit keys from parent bags,
   // which involves some calculation.
diff --git a/libs/androidfw/tests/AssetManager2_test.cpp b/libs/androidfw/tests/AssetManager2_test.cpp
index c62f095..3f22884 100644
--- a/libs/androidfw/tests/AssetManager2_test.cpp
+++ b/libs/androidfw/tests/AssetManager2_test.cpp
@@ -113,7 +113,7 @@
   desired_config.language[1] = 'e';
 
   AssetManager2 assetmanager;
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({basic_assets_});
 
   auto value = assetmanager.GetResource(basic::R::string::test1);
@@ -137,7 +137,7 @@
   desired_config.language[1] = 'e';
 
   AssetManager2 assetmanager;
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({basic_assets_, basic_de_fr_assets_});
 
   auto value = assetmanager.GetResource(basic::R::string::test1);
@@ -466,10 +466,10 @@
 TEST_F(AssetManager2Test, DensityOverride) {
   AssetManager2 assetmanager;
   assetmanager.SetApkAssets({basic_assets_, basic_xhdpi_assets_, basic_xxhdpi_assets_});
-  assetmanager.SetConfigurations({{
+  assetmanager.SetConfigurations({{{
     .density = ResTable_config::DENSITY_XHIGH,
     .sdkVersion = 21,
-  }});
+  }}});
 
   auto value = assetmanager.GetResource(basic::R::string::density, false /*may_be_bag*/);
   ASSERT_TRUE(value.has_value());
@@ -721,7 +721,7 @@
   ResTable_config desired_config;
 
   AssetManager2 assetmanager;
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({basic_assets_});
   assetmanager.SetResourceResolutionLoggingEnabled(false);
 
@@ -736,7 +736,7 @@
   ResTable_config desired_config;
 
   AssetManager2 assetmanager;
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({basic_assets_});
 
   auto result = assetmanager.GetLastResourceResolution();
@@ -751,7 +751,7 @@
 
   AssetManager2 assetmanager;
   assetmanager.SetResourceResolutionLoggingEnabled(true);
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({basic_assets_});
 
   auto value = assetmanager.GetResource(basic::R::string::test1);
@@ -774,7 +774,7 @@
 
   AssetManager2 assetmanager;
   assetmanager.SetResourceResolutionLoggingEnabled(true);
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({basic_assets_, basic_de_fr_assets_});
 
   auto value = assetmanager.GetResource(basic::R::string::test1);
@@ -796,7 +796,7 @@
 
   AssetManager2 assetmanager;
   assetmanager.SetResourceResolutionLoggingEnabled(true);
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({basic_assets_});
 
   auto value = assetmanager.GetResource(basic::R::string::test1);
@@ -817,7 +817,7 @@
 
   AssetManager2 assetmanager;
   assetmanager.SetResourceResolutionLoggingEnabled(true);
-  assetmanager.SetConfigurations({desired_config});
+  assetmanager.SetConfigurations({{desired_config}});
   assetmanager.SetApkAssets({overlayable_assets_});
 
   const auto map = assetmanager.GetOverlayableMapForPackage(0x7f);
diff --git a/libs/androidfw/tests/BenchmarkHelpers.cpp b/libs/androidfw/tests/BenchmarkHelpers.cpp
index e3fc0a0..ec2abb8 100644
--- a/libs/androidfw/tests/BenchmarkHelpers.cpp
+++ b/libs/androidfw/tests/BenchmarkHelpers.cpp
@@ -66,7 +66,7 @@
   AssetManager2 assetmanager;
   assetmanager.SetApkAssets(apk_assets);
   if (config != nullptr) {
-    assetmanager.SetConfigurations({*config});
+    assetmanager.SetConfigurations({{{*config}}});
   }
 
   while (state.KeepRunning()) {
diff --git a/libs/androidfw/tests/Theme_test.cpp b/libs/androidfw/tests/Theme_test.cpp
index 181d141..afcb0c1 100644
--- a/libs/androidfw/tests/Theme_test.cpp
+++ b/libs/androidfw/tests/Theme_test.cpp
@@ -260,7 +260,7 @@
   ResTable_config night{};
   night.uiMode = ResTable_config::UI_MODE_NIGHT_YES;
   night.version = 8u;
-  am_night.SetConfigurations({night});
+  am_night.SetConfigurations({{night}});
 
   auto theme = am.NewTheme();
   {