A duffle bag that folds up to be very small. That way, I fly out with only carryons and have a laundry bag that acts as a carry on bag in case I buy too much on vacation and can’t fit everything back in my luggage.
Someone else mentioned a walking around backpack separate from my flying/train riding backpack.
Travel wallet with Passport ID card. That way I’m carrying valid ID and some cash but not all my ID’s and cash.
A duffle bag that folds up to be very small. That way, I fly out with only carryons and have a laundry bag that acts as a carry on bag in case I buy too much on vacation and can’t fit everything back in my luggage.
Someone else mentioned a walking around backpack separate from my flying/train riding backpack.
Travel wallet with Passport ID card. That way I’m carrying valid ID and some cash but not all my ID’s and cash.
Water bottles with integrated Britta filters.