diff --git a/include/ck_bag.h b/include/ck_bag.h
index 2f7e4e4..581c844 100644
--- a/include/ck_bag.h
+++ b/include/ck_bag.h
@@ -53,9 +53,7 @@
 
 
 /*
- * Memory Allocation Strategies:
- * 	GEOMETRIC = allocate # of existing blocks * 2.
- * 	LINEAR = only allocate a single block.
+ * Growth strategies
  */
 enum ck_bag_allocation_strategy {
 	CK_BAG_ALLOCATE_GEOMETRIC = 0,
@@ -63,9 +61,9 @@ enum ck_bag_allocation_strategy {
 };
 
 /*
- *  max: max n_entries per block
- * 	bytes: sizeof(ck_bag_block) + sizeof(flex. array member)
- * 		+ inline allocator overhead
+ * max: max n_entries per block
+ * 		bytes: sizeof(ck_bag_block) + sizeof(flex. array member)
+ * 		    + inline allocator overhead
  */
 struct ck_bag_block_info {
 	size_t max;
@@ -87,7 +85,6 @@ struct ck_bag_block {
 	struct ck_bag_block_md next;
 	struct ck_bag_block *avail_next;
 	struct ck_bag_block *avail_prev;
-
 	void *array[];
 } CK_CC_CACHELINE;
 
@@ -167,9 +164,11 @@ ck_bag_next(struct ck_bag_iterator *iterator, void **entry)
 		iterator->block = ck_bag_block_next(next);
 		n_entries = (iterator->block != NULL) ?
 			ck_bag_block_count(iterator->block) : 0;
+
 		if (n_entries == 0)
 			return false;
 
+		ck_pr_load_fence();
 		iterator->index = 0;
 		iterator->n_entries = n_entries;
 	}
diff --git a/include/ck_md.h b/include/ck_md.h
index 33c5a69..4e620df 100644
--- a/include/ck_md.h
+++ b/include/ck_md.h
@@ -31,8 +31,8 @@
 #define CK_MD_CACHELINE (64)
 #endif
 
-#ifndef CK_MD_PAGE_SIZE
-#define CK_MD_PAGE_SIZE (4096)
+#ifndef CK_MD_PAGESIZE
+#define CK_MD_PAGESIZE (4096)
 #endif 
 
 #endif /* _CK_MD_H */
diff --git a/src/ck_bag.c b/src/ck_bag.c
index 490619f..a9266bb 100644
--- a/src/ck_bag.c
+++ b/src/ck_bag.c
@@ -39,7 +39,9 @@
 #define CK_BAG_CL_SIZE CK_MD_CACHELINE
 #endif
 
-#define CK_BAG_PAGE_SIZE CK_MD_PAGE_SIZE
+#ifndef CK_BAG_PAGESIZE
+#define CK_BAG_PAGESIZE CK_MD_PAGESIZE
+#endif
 
 #define CK_BAG_MAX_N_ENTRIES (1 << 12)
 
@@ -48,13 +50,10 @@ static size_t allocator_overhead;
 
 bool
 ck_bag_init(struct ck_bag *bag,
-		size_t n_block_entries,
-		enum ck_bag_allocation_strategy as)
+	    size_t n_block_entries,
+	    enum ck_bag_allocation_strategy as)
 {
-
 	size_t block_overhead;
-	if (bag == NULL)
-		return false;
 
 	bag->avail_head = bag->avail_tail = NULL;
 	bag->head = NULL;
@@ -73,7 +72,7 @@ ck_bag_init(struct ck_bag *bag,
 	block_overhead = sizeof(struct ck_bag_block) + allocator_overhead;
 
 	if (n_block_entries == CK_BAG_DEFAULT) {
-		bag->info.max = ((CK_BAG_PAGE_SIZE - block_overhead) / sizeof(void *));
+		bag->info.max = ((CK_BAG_PAGESIZE - block_overhead) / sizeof(void *));
 	} else {
 		bag->info.max = ((CK_BAG_CL_SIZE - block_overhead) / sizeof(void *));
 		if (n_block_entries > bag->info.max)
@@ -115,7 +114,6 @@ ck_bag_allocator_set(struct ck_malloc *m, size_t alloc_overhead)
 bool
 ck_bag_put_spmc(struct ck_bag *bag, void *entry)
 {
-
 	struct ck_bag_block *cursor, *new_block, *new_block_prev, *new_tail;
 	uint16_t n_entries_block;
 	size_t blocks_alloc, i;
@@ -248,7 +246,6 @@ ck_bag_put_spmc(struct ck_bag *bag, void *entry)
 bool
 ck_bag_set_spmc(struct ck_bag *bag, void *compare, void *update)
 {
-
 	struct ck_bag_block *cursor;
 	uint16_t block_index;
 	uint16_t n_entries_block = 0;