SUPERSIZE ME (AND THE OPPOSITE TOO)!
When not in use, this backpack shrinks to the size of a generously sized hamburger. So stow it away and unfurl it in an instant when the moment calls.
Dimensions:
20L: Unfold: 16.92x10.63x7.08 inches,
Fold: 6.29x5.90x1.97 inches
33L: Unfold: 19x13x8.2 inches,
Fold: 6.29x5.90x2 inches.