You. You with the backpack. If you want to travel on a crowded rush-hour commuter train, take the damn thing off before you get on; and if you stand in the passage in the middle of the carriage, blocking it for everybody who has to pass, do NOT … I repeat DO NOT! … give me a dirty look when I knock your backpack sideways as I brush past.
Why are you wearing a backpack with a business suit anyway? Please note that backpacks are only acceptable in the following situations:
1) You spend half your life in Akihabara, most of it at the AKB48 theater.
2) You commute by motorbike. (So what are you doing in the train, then?)
3) You’re a hiker or photographer.
4) You’re a dumb tourist.
Of the above, only (2) and (3) can be readily admitted in semi-polite conversation, and even (2) is suspect.
If you’re a salaryman, get a briefcase already.