Because the upper is constructed with stretch fabric

which was not as successful as they had hoped

The use of stretch material in the production significantly improves comfort when hiking

Ideal for those who need to hold whistlein mouth for extended periods of time

Adidas Power Training Backpack -Pink Fusion/Clear Pink AGE(0-3) Because the upper is constructedDescription A LIGHTWEIGHT BACKPACK MADE IN PART WITH RECYCLED MATERIALS. Hitting the books or the gym, this versatile bag has you covered. Multiple pockets keep your must haves organised and the padded sleeve protects your laptop. The durable coated base is built to withstand everything from bumps and scrapes to damp floors. Compression straps cinch it all together for a compact carrying experience. Pick up this adidas backpack and take on your day