Summer and winter are so vastly different here, it really is a night/day type thing. Winters are -30 (or colder) and summer is generally +30. It requires me to carry a lot more with us during the summer to beat off dehydration and because we’re spending more time outside.
I carry a number of things around with me all summer. They stay in my bag or go right back into it when we leave again. We might not go far during the summer, preferring to stay close to home. I have a pink tote that is huge, I can carry a lot in it, which is why I bought it. I’m not the mom carrying just a wallet, I carry everything but the kitchen sink at times.