Snow, water, or mud can get in your backpack and into a card, potentially ruining it.
We’ve been using this for a while now and are very happy with how it works.
Since cards are so small, it’s best to keep them together in one LARGER case.
With the bigger case there is less of a chance of losing any of the cards.
The case is also completely watertight and floats when dropped in water.
Very important in the elements!
