Our bag is right by the door at all times (of course!), ready and waiting for any DLR visit! Bag usually contains: 2 packable vests (his and hers), refillable water bottle, fold up/reusable bags, small first aid kit (bandaids, lip balm, Rx meds, sunscreen, etc.), portable phone charger, lanyard, a protein bar or two, etc. (depending on season or need, there may be more items). I always have a pair of bike shorts in a ziploc bag in the trunk of the car in case we make an unexpected stop at the parks when I am wearing a shorter skirt. A friend learned the hard way that evacuating a ride with low ride vehicles when the lights are on can give everyone quite a show. Bike shorts for me!