An essential for camping, but also very useful in a hotel which is why I have them in. my hotel survival kit. Not only can you use them to seal snack bags, or laundry bags, but they also come in very handy when needing to secure black out curtains that don't properly close. Can also be used to hang up clothing to dry. There are a lot of types out there, I just found these ones were effective and colorful.

Each clip is made of metal with vinyl-coated, spring-shaped clip woven from a thread, reusable and durable
Compared with wooden or plastic clip, this PVC clip not easily bend, snap or break.

These come as a 16 pack, and are 2 inches in length.