The Can-D Box

Candy can hide herself and whatever objects she brings into the box, which has an infinite space only she can enter. No object can enter the infinite space the Can-D has without Candy, and no other person can enter either, even if they're holding Candy's hand.
The box is technically capable of being destroyed, but once it is out of sight of others, it can rebuild itself as though it were never broken. The lid is the same, and can enlarge to become a sort of shield. 
Only an additional 10 LBS can enter the Can-D along with Candy herself.
The Can-D weighs as much as an empty carboard box, despite whatever is inside, and doesn't hurt at all if you're hit with it.
It has a draw back though.. You have to hold your breath while you're in there! Candy can only be in the Can-D for as long as she can hold her breath.
If the box is destroyed while Candy is inside of it, time inside the Can-D will stop. Candy can be trapped there forever if someone has their eyes on it or is recording the box, but once she's finally out, nothing about her will of changed from when the box was destroyed

Candy was given this box to her by her grandma on her 16th birthday. She finished it by the time she was 17, which was when she discovered its protective abilities