Bag clips made from willow and birch are great for sealing bags of all types. The bag clips are made from willow and birch wood balls.
The can be used for sealing coffee bags, and most other food bags. The can be used in the freezer, but do not soak in water. If they are washed or get wet dry with a cloth.
We have been making and using these for years to seal coffee and flour bags and half-used bags of peas kept in the freezer.
These will last for years but please remember that they are thin pieces of wood that can be bent