Some of them have knobs to turn, others have buttons to push. Choose the one that looks like it ll do a good job for you. Many styles have three levels for storing spices as well as other small containers. You can even get some that will expand to fit various cupboard widths. Larger sizes are sometimes available for storing bigger containers such as canned foods, olive oil, vinegars, etc.
Plastic clips are great for fastening opened bags.
Keep them handy in your kitchen for quickly closing partially used bags of frozen vegetables, nuts, cereals, etc. When she opens a bag of something that needs resealing, she folds over the bag and clips it shut with a binder clip. In many cases, the most effective helpers at mealtime can be members of your family. Make meal time preparation a family affair as often as possible. Children enjoy helping in the kitchen and often are more excited about eating the foods they help to prepare.