Reusable items, such as bags, bottles, lunch:
Reuse It - they also sell reusable produce bags and reusable bottles.
Chico Bags - they also sell reusable produce bags.
Klean Kanteen - they also have bamboo lids now, in certain varieties.
Under Armour bottles - insulated and my choice to use.
Chico Bottle Sling - makes carrying your reusable bottles much easier. Does nothing for single-use bottles.