diff --git a/monitor.py b/monitor.py
index d496a2ff..0da62cc9 100644
--- a/monitor.py
+++ b/monitor.py
@@ -835,6 +835,7 @@ class EDLogs(FileSystemEventHandler):  # type: ignore # See below
                     {self.canonicalise(x['Name']): x['Count'] for x in clean_data}
                 )
 
+            # Journal v31 implies this was removed before Odyssey launch
             elif event_type == 'BackPackMaterials':
                 # alpha4 -
                 # Lists the contents of the backpack, eg when disembarking from ship
@@ -865,6 +866,76 @@ class EDLogs(FileSystemEventHandler):  # type: ignore # See below
                     {self.canonicalise(x['Name']): x['Count'] for x in clean_data}
                 )
 
+            elif event_type == 'Backpack':
+                # TODO: v31 doc says this is`backpack.json` ... but Howard Chalkley
+                #       said it's `Backpack.json`
+                with open(join(self.currentdir, 'Backpack.json'), 'rb') as backpack:  # type: ignore
+                    try:
+                        entry = json.load(backpack)
+
+                    except json.JSONDecodeError:
+                        logger.exception('Failed decoding Backpack.json', exc_info=True)
+
+                    else:
+                        # Assume this reflects the current state when written
+                        self.state['BackPack']['Component'] = defaultdict(int)
+                        self.state['BackPack']['Consumable'] = defaultdict(int)
+                        self.state['BackPack']['Item'] = defaultdict(int)
+                        self.state['BackPack']['Data'] = defaultdict(int)
+
+                        clean_components = self.coalesce_cargo(entry['Components'])
+                        self.state['BackPack']['Component'].update(
+                            {self.canonicalise(x['Name']): x['Count'] for x in clean_components}
+                        )
+
+                        clean_consumables = self.coalesce_cargo(entry['Consumables'])
+                        self.state['BackPack']['Consumable'].update(
+                            {self.canonicalise(x['Name']): x['Count'] for x in clean_consumables}
+                        )
+
+                        clean_items = self.coalesce_cargo(entry['Items'])
+                        self.state['BackPack']['Item'].update(
+                            {self.canonicalise(x['Name']): x['Count'] for x in clean_items}
+                        )
+
+                        clean_data = self.coalesce_cargo(entry['Data'])
+                        self.state['BackPack']['Data'].update(
+                            {self.canonicalise(x['Name']): x['Count'] for x in clean_data}
+                        )
+
+            elif event_type == 'BackpackChange':
+                # Changes to Odyssey Backpack contents *other* than from a Transfer
+                # See TransferMicroResources event for that.
+
+                if entry.get('Added') is not None:
+                    changes = 'Added'
+
+                elif entry.get('Removed') is not None:
+                    changes = 'Removed'
+
+                else:
+                    logger.warning(f'BackpackChange with neither Added nor Removed: {entry=}')
+                    changes = ''
+
+                if changes != '':
+                    for c in entry[changes]:
+                        category = self.category(c['Type'])
+                        name = self.canonicalise(c['Name'])
+
+                        if changes == 'Removed':
+                            self.state['BackPack'][category][name] -= c['Count']
+
+                        elif changes == 'Added':
+                            self.state['BackPack'][category][name] += c['Count']
+
+                # Paranoia check to see if anything has gone negative.
+                # As of Odyssey Alpha Phase 1 Hotfix 2 keeping track of BackPack
+                # materials is impossible when used/picked up anyway.
+                for c in self.state['BackPack']:
+                    for m in self.state['BackPack'][c]:
+                        if self.state['BackPack'][c][m] < 0:
+                            self.state['BackPack'][c][m] = 0
+
             elif event_type == 'BuyMicroResources':
                 # Buying from a Pioneer Supplies, goes directly to ShipLocker.
                 # One event per Item, not an array.
@@ -961,6 +1032,11 @@ class EDLogs(FileSystemEventHandler):  # type: ignore # See below
                         if self.state['BackPack']['Consumable'][c] < 0:
                             self.state['BackPack']['Consumable'][c] = 0
 
+            # TODO:
+            # <https://forums.frontier.co.uk/threads/575010/>
+            # also there's one additional journal event that was missed out from
+            # this version of the docs: "SuitLoadout": # when starting on foot, or
+            # when disembarking from a ship, with the same info as found in "CreateSuitLoadout"
             elif event_type == 'SwitchSuitLoadout':
                 loadoutid = entry['LoadoutID']
                 new_slot = self.suit_loadout_id_from_loadoutid(loadoutid)