When i go long distance exercise, I'd take, my meter, make sure it's got plenty strips and battery; plenty sugary food for hypo - exercise tens to lower sugar's, some people, drastically, so take less basal; spare insulin site, an insulin pen. Make sure pump has insulin and battery. Regular snack, like a nature valley bar, if sugar's keep dropping and need it. A card or bracelet that says you have diabetes.
Sometimes i take out the meter and strips from the purse like pocket it comes with to save space.
Test frequently, especially at the beginning,