diff --git a/clap_complete/src/generator/mod.rs b/clap_complete/src/generator/mod.rs
index 1bdb6da1..dd9c0584 100644
--- a/clap_complete/src/generator/mod.rs
+++ b/clap_complete/src/generator/mod.rs
@@ -170,7 +170,7 @@ pub fn generate_to<G, S, T>(
 ) -> Result<PathBuf, Error>
 where
     G: Generator,
-    S: Into<clap::Str>,
+    S: Into<clap::builder::Str>,
     T: Into<OsString>,
 {
     cmd.set_bin_name(bin_name);
@@ -223,7 +223,7 @@ where
 pub fn generate<G, S>(gen: G, cmd: &mut clap::Command, bin_name: S, buf: &mut dyn Write)
 where
     G: Generator,
-    S: Into<clap::Str>,
+    S: Into<clap::builder::Str>,
 {
     cmd.set_bin_name(bin_name);
     _generate::<G, S>(gen, cmd, buf)
@@ -232,7 +232,7 @@ where
 fn _generate<G, S>(gen: G, cmd: &mut clap::Command, buf: &mut dyn Write)
 where
     G: Generator,
-    S: Into<clap::Str>,
+    S: Into<clap::builder::Str>,
 {
     cmd.build();
 
diff --git a/clap_derive/src/derives/args.rs b/clap_derive/src/derives/args.rs
index ea2ad1bd..46a26da2 100644
--- a/clap_derive/src/derives/args.rs
+++ b/clap_derive/src/derives/args.rs
@@ -228,14 +228,14 @@ pub fn gen_augment(
                 let next_display_order = attrs.next_display_order();
                 if override_required {
                     Some(quote_spanned! { kind.span()=>
-                        let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::Str::from(s.to_owned()));
+                        let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::builder::Str::from(s.to_owned()));
                         let #app_var = #app_var #next_help_heading #next_display_order;
                         let #app_var = <#ty as clap::Args>::augment_args_for_update(#app_var);
                         let #app_var = #app_var.next_help_heading(clap::builder::Resettable::from(#old_heading_var));
                     })
                 } else {
                     Some(quote_spanned! { kind.span()=>
-                        let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::Str::from(s.to_owned()));
+                        let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::builder::Str::from(s.to_owned()));
                         let #app_var = #app_var #next_help_heading #next_display_order;
                         let #app_var = <#ty as clap::Args>::augment_args(#app_var);
                         let #app_var = #app_var.next_help_heading(clap::builder::Resettable::from(#old_heading_var));
diff --git a/clap_derive/src/derives/subcommand.rs b/clap_derive/src/derives/subcommand.rs
index e614a38f..150860ea 100644
--- a/clap_derive/src/derives/subcommand.rs
+++ b/clap_derive/src/derives/subcommand.rs
@@ -193,14 +193,14 @@ fn gen_augment(
                         let next_display_order = attrs.next_display_order();
                         let subcommand = if override_required {
                             quote! {
-                                let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::Str::from(s.to_owned()));
+                                let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::builder::Str::from(s.to_owned()));
                                 let #app_var = #app_var #next_help_heading #next_display_order;
                                 let #app_var = <#ty as clap::Subcommand>::augment_subcommands_for_update(#app_var);
                                 let #app_var = #app_var.next_help_heading(clap::builder::Resettable::from(#old_heading_var));
                             }
                         } else {
                             quote! {
-                                let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::Str::from(s.to_owned()));
+                                let #old_heading_var = #app_var.get_next_help_heading().map(|s| clap::builder::Str::from(s.to_owned()));
                                 let #app_var = #app_var #next_help_heading #next_display_order;
                                 let #app_var = <#ty as clap::Subcommand>::augment_subcommands(#app_var);
                                 let #app_var = #app_var.next_help_heading(clap::builder::Resettable::from(#old_heading_var));
diff --git a/src/builder/arg.rs b/src/builder/arg.rs
index 2a4ac4bd..aa9fdf35 100644
--- a/src/builder/arg.rs
+++ b/src/builder/arg.rs
@@ -14,12 +14,12 @@ use std::{
 use super::{ArgFlags, ArgSettings};
 use crate::builder::ArgPredicate;
 use crate::builder::IntoResettable;
+use crate::builder::OsStr;
 use crate::builder::PossibleValue;
+use crate::builder::Str;
 use crate::builder::ValueRange;
 use crate::ArgAction;
 use crate::Id;
-use crate::OsStr;
-use crate::Str;
 use crate::ValueHint;
 use crate::INTERNAL_ERROR_MSG;
 
@@ -3721,14 +3721,14 @@ impl Arg {
     /// # Examples
     ///
     /// ```rust
-    /// # use clap::OsStr;
+    /// # use std::ffi::OsStr;
     /// # use clap::Arg;
     /// let arg = Arg::new("foo").env("ENVIRONMENT");
-    /// assert_eq!(arg.get_env(), Some(&OsStr::from("ENVIRONMENT")));
+    /// assert_eq!(arg.get_env(), Some(OsStr::new("ENVIRONMENT")));
     /// ```
     #[cfg(feature = "env")]
-    pub fn get_env(&self) -> Option<&OsStr> {
-        self.env.as_ref().map(|x| &x.0)
+    pub fn get_env(&self) -> Option<&std::ffi::OsStr> {
+        self.env.as_ref().map(|x| x.0.as_os_str())
     }
 
     /// Get the default values specified for this argument, if any
diff --git a/src/builder/arg_predicate.rs b/src/builder/arg_predicate.rs
index 34768659..39a7e23e 100644
--- a/src/builder/arg_predicate.rs
+++ b/src/builder/arg_predicate.rs
@@ -1,4 +1,4 @@
-use crate::OsStr;
+use crate::builder::OsStr;
 
 /// Operations to perform on argument values
 ///
diff --git a/src/builder/command.rs b/src/builder/command.rs
index 7599f006..c98f4d79 100644
--- a/src/builder/command.rs
+++ b/src/builder/command.rs
@@ -12,6 +12,7 @@ use crate::builder::arg_settings::ArgSettings;
 use crate::builder::ArgAction;
 use crate::builder::IntoResettable;
 use crate::builder::PossibleValue;
+use crate::builder::Str;
 use crate::builder::{Arg, ArgGroup, ArgPredicate};
 use crate::error::ErrorKind;
 use crate::error::Result as ClapResult;
@@ -22,7 +23,6 @@ use crate::parser::{ArgMatcher, ArgMatches, Parser};
 use crate::util::ChildGraph;
 use crate::util::FlatMap;
 use crate::util::{color::ColorChoice, Id};
-use crate::Str;
 use crate::{Error, INTERNAL_ERROR_MSG};
 
 #[cfg(debug_assertions)]
diff --git a/src/builder/debug_asserts.rs b/src/builder/debug_asserts.rs
index 93dc39bd..140a5ad9 100644
--- a/src/builder/debug_asserts.rs
+++ b/src/builder/debug_asserts.rs
@@ -2,12 +2,12 @@ use std::cmp::Ordering;
 
 use clap_lex::RawOsStr;
 
+use crate::builder::OsStr;
 use crate::builder::ValueRange;
 use crate::mkeymap::KeyType;
 use crate::util::FlatSet;
 use crate::util::Id;
 use crate::ArgAction;
-use crate::OsStr;
 use crate::INTERNAL_ERROR_MSG;
 use crate::{Arg, Command, ValueHint};
 
diff --git a/src/builder/mod.rs b/src/builder/mod.rs
index 23ad15a9..a8c2613c 100644
--- a/src/builder/mod.rs
+++ b/src/builder/mod.rs
@@ -7,9 +7,11 @@ mod arg_group;
 mod arg_predicate;
 mod arg_settings;
 mod command;
+mod os_str;
 mod possible_value;
 mod range;
 mod resettable;
+mod str;
 mod value_hint;
 mod value_parser;
 
@@ -19,11 +21,13 @@ mod debug_asserts;
 #[cfg(test)]
 mod tests;
 
+pub use self::str::Str;
 pub use action::ArgAction;
 pub use arg::Arg;
 pub use arg_group::ArgGroup;
 pub use arg_predicate::ArgPredicate;
 pub use command::Command;
+pub use os_str::OsStr;
 pub use possible_value::PossibleValue;
 pub use range::ValueRange;
 pub use resettable::IntoResettable;
@@ -48,6 +52,8 @@ pub use value_parser::ValueParser;
 pub use value_parser::ValueParserFactory;
 pub use value_parser::_AnonymousValueParser;
 
+#[allow(unused_imports)]
+pub(crate) use self::str::Inner as StrInner;
 pub(crate) use action::CountType;
 pub(crate) use arg::render_arg_val;
 pub(crate) use arg_settings::{ArgFlags, ArgSettings};
diff --git a/src/util/os_str.rs b/src/builder/os_str.rs
similarity index 91%
rename from src/util/os_str.rs
rename to src/builder/os_str.rs
index cf75823f..9e815d4d 100644
--- a/src/util/os_str.rs
+++ b/src/builder/os_str.rs
@@ -1,3 +1,5 @@
+use crate::builder::Str;
+
 /// A UTF-8-encoded fixed string
 #[derive(Default, Clone, Eq, PartialEq, PartialOrd, Ord, Hash)]
 pub struct OsStr {
@@ -41,35 +43,35 @@ impl From<&'_ OsStr> for OsStr {
 }
 
 #[cfg(feature = "perf")]
-impl From<crate::Str> for OsStr {
-    fn from(id: crate::Str) -> Self {
+impl From<Str> for OsStr {
+    fn from(id: Str) -> Self {
         match id.into_inner() {
-            crate::util::StrInner::Static(s) => Self::from_static_ref(std::ffi::OsStr::new(s)),
-            crate::util::StrInner::Owned(s) => Self::from_ref(std::ffi::OsStr::new(s.as_ref())),
+            crate::builder::StrInner::Static(s) => Self::from_static_ref(std::ffi::OsStr::new(s)),
+            crate::builder::StrInner::Owned(s) => Self::from_ref(std::ffi::OsStr::new(s.as_ref())),
         }
     }
 }
 
 #[cfg(not(feature = "perf"))]
-impl From<crate::Str> for OsStr {
-    fn from(id: crate::Str) -> Self {
+impl From<Str> for OsStr {
+    fn from(id: Str) -> Self {
         Self::from_ref(std::ffi::OsStr::new(id.as_str()))
     }
 }
 
 #[cfg(feature = "perf")]
-impl From<&'_ crate::Str> for OsStr {
-    fn from(id: &'_ crate::Str) -> Self {
+impl From<&'_ Str> for OsStr {
+    fn from(id: &'_ Str) -> Self {
         match id.clone().into_inner() {
-            crate::util::StrInner::Static(s) => Self::from_static_ref(std::ffi::OsStr::new(s)),
-            crate::util::StrInner::Owned(s) => Self::from_ref(std::ffi::OsStr::new(s.as_ref())),
+            crate::builder::StrInner::Static(s) => Self::from_static_ref(std::ffi::OsStr::new(s)),
+            crate::builder::StrInner::Owned(s) => Self::from_ref(std::ffi::OsStr::new(s.as_ref())),
         }
     }
 }
 
 #[cfg(not(feature = "perf"))]
-impl From<&'_ crate::Str> for OsStr {
-    fn from(id: &'_ crate::Str) -> Self {
+impl From<&'_ Str> for OsStr {
+    fn from(id: &'_ Str) -> Self {
         Self::from_ref(std::ffi::OsStr::new(id.as_str()))
     }
 }
diff --git a/src/builder/possible_value.rs b/src/builder/possible_value.rs
index d645bb5a..acf671b2 100644
--- a/src/builder/possible_value.rs
+++ b/src/builder/possible_value.rs
@@ -1,7 +1,7 @@
 use std::{borrow::Cow, iter};
 
+use crate::builder::Str;
 use crate::util::eq_ignore_case;
-use crate::Str;
 
 /// A possible value of an argument.
 ///
diff --git a/src/builder/resettable.rs b/src/builder/resettable.rs
index 297bae48..e7b111d0 100644
--- a/src/builder/resettable.rs
+++ b/src/builder/resettable.rs
@@ -1,6 +1,9 @@
 // Unlike `impl Into<Option<T>>` or `Option<impl Into<T>>`, this isn't ambiguous for the `None`
 // case.
 
+use crate::builder::OsStr;
+use crate::builder::Str;
+
 /// Clearable builder value
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum Resettable<T> {
@@ -40,8 +43,8 @@ pub trait IntoResettable<T> {
     fn into_resettable(self) -> Resettable<T>;
 }
 
-impl IntoResettable<crate::OsStr> for Option<&'static str> {
-    fn into_resettable(self) -> Resettable<crate::OsStr> {
+impl IntoResettable<OsStr> for Option<&'static str> {
+    fn into_resettable(self) -> Resettable<OsStr> {
         match self {
             Some(s) => Resettable::Value(s.into()),
             None => Resettable::Reset,
@@ -49,8 +52,8 @@ impl IntoResettable<crate::OsStr> for Option<&'static str> {
     }
 }
 
-impl IntoResettable<crate::Str> for Option<&'static str> {
-    fn into_resettable(self) -> Resettable<crate::Str> {
+impl IntoResettable<Str> for Option<&'static str> {
+    fn into_resettable(self) -> Resettable<Str> {
         match self {
             Some(s) => Resettable::Value(s.into()),
             None => Resettable::Reset,
@@ -64,14 +67,14 @@ impl<T> IntoResettable<T> for Resettable<T> {
     }
 }
 
-impl<I: Into<crate::OsStr>> IntoResettable<crate::OsStr> for I {
-    fn into_resettable(self) -> Resettable<crate::OsStr> {
+impl<I: Into<OsStr>> IntoResettable<OsStr> for I {
+    fn into_resettable(self) -> Resettable<OsStr> {
         Resettable::Value(self.into())
     }
 }
 
-impl<I: Into<crate::Str>> IntoResettable<crate::Str> for I {
-    fn into_resettable(self) -> Resettable<crate::Str> {
+impl<I: Into<Str>> IntoResettable<Str> for I {
+    fn into_resettable(self) -> Resettable<Str> {
         Resettable::Value(self.into())
     }
 }
diff --git a/src/util/str.rs b/src/builder/str.rs
similarity index 100%
rename from src/util/str.rs
rename to src/builder/str.rs
diff --git a/src/lib.rs b/src/lib.rs
index 7553d6b6..0f9d25a8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -109,8 +109,6 @@ pub use crate::util::color::ColorChoice;
 #[allow(unused_imports)]
 pub(crate) use crate::util::color::ColorChoice;
 pub use crate::util::Id;
-pub use crate::util::OsStr;
-pub use crate::util::Str;
 
 pub use crate::derive::{Args, CommandFactory, FromArgMatches, Parser, Subcommand, ValueEnum};
 
diff --git a/src/macros.rs b/src/macros.rs
index dfd232ab..0bb8eaff 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -48,9 +48,9 @@ macro_rules! crate_authors {
     ($sep:expr) => {{
         let authors = env!("CARGO_PKG_AUTHORS");
         if authors.contains(':') {
-            $crate::Str::from(authors.replace(':', $sep))
+            $crate::builder::Str::from(authors.replace(':', $sep))
         } else {
-            $crate::Str::from(authors)
+            $crate::builder::Str::from(authors)
         }
     }};
     () => {
diff --git a/src/mkeymap.rs b/src/mkeymap.rs
index 19fac98a..3c660171 100644
--- a/src/mkeymap.rs
+++ b/src/mkeymap.rs
@@ -1,8 +1,8 @@
 use std::iter::Iterator;
 use std::ops::Index;
 
+use crate::builder::OsStr;
 use crate::Arg;
-use crate::OsStr;
 use crate::INTERNAL_ERROR_MSG;
 
 #[derive(PartialEq, Eq, Debug, Clone)]
diff --git a/src/output/help.rs b/src/output/help.rs
index 66d84496..9f04451f 100644
--- a/src/output/help.rs
+++ b/src/output/help.rs
@@ -7,10 +7,10 @@ use std::usize;
 
 // Internal
 use crate::builder::PossibleValue;
+use crate::builder::Str;
 use crate::builder::{render_arg_val, Arg, Command};
 use crate::output::{fmt::Colorizer, Usage};
 use crate::util::FlatSet;
-use crate::util::Str;
 use crate::ArgAction;
 
 // Third party
diff --git a/src/parser/matches/arg_matches.rs b/src/parser/matches/arg_matches.rs
index 31734290..858e6ba8 100644
--- a/src/parser/matches/arg_matches.rs
+++ b/src/parser/matches/arg_matches.rs
@@ -6,6 +6,7 @@ use std::iter::{Cloned, Flatten, Map};
 use std::slice::Iter;
 
 // Internal
+use crate::builder::Str;
 use crate::parser::AnyValue;
 use crate::parser::AnyValueId;
 use crate::parser::MatchedArg;
@@ -13,7 +14,6 @@ use crate::parser::MatchesError;
 use crate::parser::ValueSource;
 use crate::util::FlatMap;
 use crate::util::Id;
-use crate::Str;
 use crate::INTERNAL_ERROR_MSG;
 
 /// Container for parse results.
diff --git a/src/parser/parser.rs b/src/parser/parser.rs
index 9bbfb738..7731735a 100644
--- a/src/parser/parser.rs
+++ b/src/parser/parser.rs
@@ -9,6 +9,7 @@ use clap_lex::RawOsStr;
 use clap_lex::RawOsString;
 
 // Internal
+use crate::builder::Str;
 use crate::builder::{Arg, Command};
 use crate::error::Error as ClapError;
 use crate::error::Result as ClapResult;
@@ -21,7 +22,6 @@ use crate::parser::{ArgMatcher, SubCommand};
 use crate::parser::{Validator, ValueSource};
 use crate::util::Id;
 use crate::ArgAction;
-use crate::Str;
 use crate::{INTERNAL_ERROR_MSG, INVALID_UTF8};
 
 pub(crate) struct Parser<'cmd> {
@@ -1425,7 +1425,7 @@ impl<'cmd> Parser<'cmd> {
                 let arg_values: Vec<_> = arg
                     .default_vals
                     .iter()
-                    .map(crate::OsStr::to_os_string)
+                    .map(crate::builder::OsStr::to_os_string)
                     .collect();
                 let trailing_idx = None;
                 let _ = self.react(
diff --git a/src/util/id.rs b/src/util/id.rs
index c5925906..a6ee26ef 100644
--- a/src/util/id.rs
+++ b/src/util/id.rs
@@ -1,4 +1,4 @@
-use crate::Str;
+use crate::builder::Str;
 
 /// [`Arg`][crate::Arg] or [`ArgGroup`][crate::ArgGroup] identifier
 ///
diff --git a/src/util/mod.rs b/src/util/mod.rs
index 6f77c37a..ed38fbc5 100644
--- a/src/util/mod.rs
+++ b/src/util/mod.rs
@@ -4,20 +4,14 @@ mod flat_map;
 mod flat_set;
 mod graph;
 mod id;
-mod os_str;
-mod str;
 mod str_to_bool;
 
 pub use self::id::Id;
-pub use self::os_str::OsStr;
-pub use self::str::Str;
 
 pub(crate) use self::flat_map::Entry;
 pub(crate) use self::flat_map::FlatMap;
 pub(crate) use self::flat_set::FlatSet;
 pub(crate) use self::graph::ChildGraph;
-#[allow(unused_imports)]
-pub(crate) use self::str::Inner as StrInner;
 pub(crate) use self::str_to_bool::str_to_bool;
 pub(crate) use self::str_to_bool::FALSE_LITERALS;
 pub(crate) use self::str_to_bool::TRUE_LITERALS;