The BCCA just found that a person who throws their backpack off while running from police abandons it and forfeits any privacy interest in the backpack and its contents, such that police have the right to search it.
“If you have to lose or drop or throw away any belongings while you are running from the police, those are considered to be abandoned and the police have the right to take them and search them and anything that’s found in them can then be held against you.”