diff --git a/stacbuilder/stacapi/endpoints.py b/stacbuilder/stacapi/endpoints.py
index d807f4c..68699b8 100644
--- a/stacbuilder/stacapi/endpoints.py
+++ b/stacbuilder/stacapi/endpoints.py
@@ -191,21 +191,11 @@ def _add_authentication_section(self, collection: Collection) -> dict:
 class ItemsEndpoint:
     def __init__(self, rest_api: RestApi) -> None:
         self._rest_api: RestApi = rest_api
-        # self._stac_api_url = URL(stac_api_url)
-        # self._auth = auth or None
 
     @staticmethod
     def create_endpoint(stac_api_url: URL, auth: AuthBase | None) -> "ItemsEndpoint":
         return ItemsEndpoint(rest_api=RestApi(base_url=stac_api_url, auth=auth))
 
-    # @property
-    # def stac_api_url(self) -> URL:
-    #     return self._stac_api_url
-
-    # @property
-    # def rest_api(self) -> RestApi:
-    #     return self._rest_api
-
     @property
     def stac_api_url(self) -> URL:
         return self._rest_api.base_url
@@ -281,25 +271,36 @@ def exists(self, item: Item) -> bool:
 
     def create(self, item: Item) -> dict:
         item.validate()
+
         response = self._rest_api.post(self.get_items_url(item.collection_id), json=item.to_dict())
+        _logger.info(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
+        print(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
+
         _check_response_status(response, _EXPECTED_STATUS_POST)
         return response.json()
 
+    def update(self, item: Item) -> dict:
+        item.validate()
+
+        response = self._rest_api.put(self.get_items_url_for_id(item.collection_id, item.id), json=item.to_dict())
+        _logger.info(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
+        print(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
+
+        _check_response_status(response, _EXPECTED_STATUS_PUT)
+        return response.json()
+
     def ingest_bulk(self, items: Iterable[Item]) -> dict:
         collection_id = items[0].collection_id
         if not all(i.collection_id == collection_id for i in items):
             raise Exception("All collection IDs should be identical for bulk ingests")
 
-        url_path = str(self._stac_api_url / "collections" / str(collection_id) / "bulk_items")
-        data = {"items": {item.id: item.to_dict() for item in items}}
+        url_path = f"collections/{collection_id}/bulk_items"
+        data = {"method": "upsert", "items": {item.id: item.to_dict() for item in items}}
         response = self._rest_api.post(url_path, json=data)
-        _check_response_status(response, _EXPECTED_STATUS_POST)
-        return response.json()
+        _logger.info(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
+        print(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
 
-    def update(self, item: Item) -> dict:
-        item.validate()
-        response = self._rest_api.put(self.get_items_url_for_id(item.collection_id, item.id), json=item.to_dict())
-        _check_response_status(response, _EXPECTED_STATUS_PUT)
+        _check_response_status(response, _EXPECTED_STATUS_POST)
         return response.json()
 
     def create_or_update(self, item: Item) -> dict:
@@ -318,7 +319,11 @@ def delete_by_id(self, collection_id: str, item_id: str) -> dict:
             raise InvalidOperation(
                 f"item_id must have a non-empty str value. Actual type and value: {type(item_id)=}, {item_id=!r}"
             )
+
         response = self._rest_api.delete(self.get_items_url_for_id(collection_id, item_id))
+        _logger.info(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
+        print(f"HTTP response: {response.status_code} - {response.reason}: body: {response.json()}")
+
         _check_response_status(response, _EXPECTED_STATUS_DELETE)
         return response.json()
 
diff --git a/stacbuilder/stacapi/upload.py b/stacbuilder/stacapi/upload.py
index 0833120..b651f2e 100644
--- a/stacbuilder/stacapi/upload.py
+++ b/stacbuilder/stacapi/upload.py
@@ -18,9 +18,10 @@
 
 
 class Uploader:
-    def __init__(self, collections_ep: CollectionsEndpoint, items_ep: ItemsEndpoint) -> None:
+    def __init__(self, collections_ep: CollectionsEndpoint, items_ep: ItemsEndpoint, bulk_size: int = 20) -> None:
         self._collections_endpoint = collections_ep
         self._items_endpoint = items_ep
+        self._bulk_size = bulk_size
 
     @classmethod
     def from_settings(cls, settings: Settings) -> "Uploader":
@@ -38,9 +39,17 @@ def create_uploader(
             rest_api=rest_api,
             collection_auth_info=collection_auth_info,
         )
-        items_endpoint = ItemsEndpoint(stac_api_url=stac_api_url, auth=auth)
+        items_endpoint = ItemsEndpoint(rest_api)
         return Uploader(collections_ep=collections_endpoint, items_ep=items_endpoint)
 
+    @property
+    def bulk_size(self) -> int:
+        return self._bulk_size
+
+    @bulk_size.setter
+    def bulk_size(self, value: int) -> int:
+        self._bulk_size = int(value)
+
     def upload_collection(self, collection: Path | Collection) -> dict:
         if isinstance(collection, Path):
             collection = Collection.from_file(str(collection))
@@ -56,10 +65,19 @@ def upload_item(self, item) -> dict:
         return self._items_endpoint.create_or_update(item)
 
     def upload_items_bulk(self, collection_id: str, items: Iterable[Item]) -> None:
+        chunk = []
         for item in items:
             self._prepare_item(item, collection_id)
             item.validate()
-            self.upload_item(item)
+
+            chunk.append(item)
+
+            if len(chunk) == self.bulk_size:
+                self._items_endpoint.ingest_bulk(chunk)
+                chunk = []
+
+        if chunk:
+            self._items_endpoint.ingest_bulk(chunk)
 
     def upload_collection_and_items(
         self, collection: Path | Collection, items: Path | list[Item], max_items: int = -1