diff --git a/src/ext/intervalheap.h b/src/ext/intervalheap.h
index 8b46636..553605e 100644
--- a/src/ext/intervalheap.h
+++ b/src/ext/intervalheap.h
@@ -21,9 +21,11 @@
 #ifndef CMC_INTERVALHEAP_H
 #define CMC_INTERVALHEAP_H
 
-#include <stdlib.h>
 #include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
+#include "../utl/cmc_string.h"
 
 #define INTERVALHEAP_GENERATE(PFX, SNAME, FMOD, V)    \
     INTERVALHEAP_GENERATE_HEADER(PFX, SNAME, FMOD, V) \
@@ -115,6 +117,8 @@
     FMOD bool PFX##_full(SNAME *_heap_);                                     \
     FMOD size_t PFX##_count(SNAME *_heap_);                                  \
     FMOD size_t PFX##_capacity(SNAME *_heap_);                               \
+    /* Collection Utility */                                                 \
+    FMOD cmc_string PFX##_to_string(SNAME *_heap_);                          \
                                                                              \
     /* Iterator Functions */                                                 \
     /* Iterator Allocation and Deallocation */                               \
@@ -478,8 +482,19 @@
                                                                                             \
     FMOD size_t PFX##_capacity(SNAME *_heap_)                                               \
     {                                                                                       \
-        /* Multiply by 2 since each node can store two elements */                          \
-        return _heap_->capacity * 2;                                                        \
+        return _heap_->capacity;                                                            \
+    }                                                                                       \
+                                                                                            \
+    FMOD cmc_string PFX##_to_string(SNAME *_heap_)                                          \
+    {                                                                                       \
+        cmc_string str;                                                                     \
+        SNAME *h_ = _heap_;                                                                 \
+        const char *name = #SNAME;                                                          \
+                                                                                            \
+        snprintf(str.s, cmc_string_len, cmc_string_fmt_intervalheap,                        \
+                 name, h_, h_->buffer, h_->capacity, h_->size, h_->count, h_->cmp);         \
+                                                                                            \
+        return str;                                                                         \
     }                                                                                       \
                                                                                             \
     FMOD SNAME##_iter *PFX##_iter_new(SNAME *target)                                        \
diff --git a/src/ext/multimap.h b/src/ext/multimap.h
index abac290..4d2b30a 100644
--- a/src/ext/multimap.h
+++ b/src/ext/multimap.h
@@ -43,9 +43,11 @@
 #ifndef CMC_MULTIMAP_H
 #define CMC_MULTIMAP_H
 
-#include <stdlib.h>
 #include <stdbool.h>
+#include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
+#include "../utl/cmc_string.h"
 
 #ifndef CMC_HASH_TABLE_SETUP
 #define CMC_HASH_TABLE_SETUP
@@ -192,6 +194,8 @@ static const size_t cmc_hashtable_primes[] = {53, 97, 191, 383, 769, 1531,
     FMOD bool PFX##_empty(SNAME *_map_);                                                          \
     FMOD size_t PFX##_count(SNAME *_map_);                                                        \
     FMOD size_t PFX##_capacity(SNAME *_map_);                                                     \
+    /* Collection Utility */                                                                      \
+    FMOD cmc_string PFX##_to_string(SNAME *_map_);                                                \
                                                                                                   \
     /* Iterator Functions */                                                                      \
     /* Iterator Allocation and Deallocation */                                                    \
@@ -579,6 +583,18 @@ static const size_t cmc_hashtable_primes[] = {53, 97, 191, 383, 769, 1531,
         return _map_->capacity;                                                                  \
     }                                                                                            \
                                                                                                  \
+    FMOD cmc_string PFX##_to_string(SNAME *_map_)                                                \
+    {                                                                                            \
+        cmc_string str;                                                                          \
+        SNAME *m_ = _map_;                                                                       \
+        const char *name = #SNAME;                                                               \
+                                                                                                 \
+        snprintf(str.s, cmc_string_len, cmc_string_fmt_hashmap,                                  \
+                 name, m_, m_->buffer, m_->capacity, m_->count, m_->load, m_->cmp, m_->hash);    \
+                                                                                                 \
+        return str;                                                                              \
+    }                                                                                            \
+                                                                                                 \
     FMOD SNAME##_iter *PFX##_iter_new(SNAME *target)                                             \
     {                                                                                            \
         SNAME##_iter *iter = malloc(sizeof(SNAME##_iter));                                       \
diff --git a/src/utl/cmc_string.h b/src/utl/cmc_string.h
index 7169330..ecf726c 100644
--- a/src/utl/cmc_string.h
+++ b/src/utl/cmc_string.h
@@ -35,6 +35,8 @@ static const char *cmc_string_fmt_stack = "%s at %p { buffer:%p, capacity:%" PRI
 static const char *cmc_string_fmt_treemap = "%s at %p { root:%p, count:%" PRIuMAX ", cmp:%p }";
 static const char *cmc_string_fmt_treeset = "%s at %p { root:%p, count:%" PRIuMAX ", cmp:%p }";
 
+static const char *cmc_string_fmt_intervalheap = "%s at %p { buffer:%p, capacity:%" PRIuMAX ", size:%" PRIuMAX ", count:%" PRIuMAX ", cmp:%p }";
+static const char *cmc_string_fmt_multimap = "%s at %p { buffer:%p, capacity:%" PRIuMAX ", count:%" PRIuMAX ", load:%lf, cmp:%p, hash:%p }";
 static const char *cmc_string_fmt_multiset = "%s at %p { buffer:%p, capacity:%" PRIuMAX ", count:%" PRIuMAX ", cardinality:%" PRIuMAX ", load:%lf, cmp:%p, hash:%p }";;
 
 #endif /* CMC_STRING_H */