Snacks, diapers, wipes, extra bags (usually doggie poop bags in case the 4yr old needs to squat), drinks, small first aid kit... we actually have a portable potty chair now that my son is potty training and it fits into one of their small backpacks. My older two (4&2) sometimes carry their own backpacks in which case my oldest carries the potty seat, bags, and TP in hers. But for one backpack, my daughter knows how to squat and we use the doggie bags for... well you know lol. We also have backup batteries for our phones and basic like flashlight, extra fire starter, just in case type items that don't take up much space.
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