When putting the cards in the box, take a small stack(around 20 cards) hold them 45 degree and place them in the box. Push on the high side of the cards and then the cards are in the box, repeat this process until all the cards are in the box. The reason why it is a little hard to put the cards in is because the cards need to be strongly cealed in the storage box for when the clip breaks(for example because you let the box fall).

When i was playing uno with my friends and stopped i couldn't stash my uno cards any where and was walking i was taking a big risk by letting all of the cards fall so i came up with an idea to make a uno card box travel version so that anyone can play uno when moving in the car or in the plane without all of the cards flying everywhere. These 2 boxed hold all of the cards and make sure that the cards that every player something takes sometime through the game is strongly anti fabrated and the other box is made to let all the player lay the cards in when playing the game. The funtions are under the 2 boxed and when you put those 2 boxed into each other there is a clip that hold them togheter too.