100 cal snack container set with instructions for portion control for men, women and children portion perfection what our customers say perfect! i am in love with my snack containers and the poster that came with it giving me ideas is perfect - there are foods i hadn't even thought of! - leigh m so useful, i have been using this every day in my job and i love it. helps me be creative about snacks and not worry if i am eating too much. it has really encouraged me to eat well and feel as if i have enough supplies at work without delving into buying stuff i don't really need. - emma o don't have to think about measurements. just put your snacks in the right size snack cup. win. win. - cherly l based on scientific portion control research the portion perfection snacker includes the blenderbottle gostak starter 4pak and downloadable handy guide to healthy 100 calorie snacks that fit perfectly into each sized container. the starter 4pak, features a removable carry handle and is stain and odor resistant. made of durable eastman tritan plastic, the gostak jars remain clean, clear, and fresh regardless of what is carried in them the day before. twist n' lock technology easily attaches jars to each other in any order and size. a quick quarter-turn locks them together, making for simple, streamlined portability. click the buy now button for a healthier snack solution. nb: this product is unsuitable for microwave ovens and not intended for use with very high temperature foods.