Yes football boots can fit inside.
The main compartment has a padded slip in pocket which can fit any device 28 cm x 40 cm
There are 3 sections of the backpack that zip - 2 are large and could fit books/clothes/sports gear. One of these has an additional section within it to keep items (pens/stylus/cards/wallet) more organised. The 3rd one is on the side and can be used to store your mobile phone/wallet/keys during your workout.
The main pocket has two pullers which can be used to attache a padlock . This will prevent opportunistic pick pockets from easily getting inside your bag's contents.
This backpack is a great daypack. You can fit a 17" laptop, plus a tablet or iPad, along with your wallet, SLR camera, phone, sunglasses and jumper or light jacket.
Yes, the external side zip pocket can fit standard bottles, it has an elastic trimmed pocket to allow expansion of the pocket
The outer material of this backpack is made from water-repellent nylon. It is perfect for those occasions when you are caught in an unexpected rain shower. However, if you accidentally dropped your bag in a pool of water, or if the bag gets soaked in a heavy downpour then water could seep through the zippers and the edges of the various compartments.
We suggest you wipe your bag with a damp soft cloth, using warm water. For more stubborn stains use a light detergent.