VOLGANIK ROCKCanvas Tote Bag Waterproof Nylon Multi Pocket Shoulder Bags Laptop Work Bag Teacher Purse Handbag for Women Men

Q: Are the side pockets big enough to hold a regular water bottle? It looks tight fit & narrow from the photos & video.

Yes, it can hold a regular water bottle, a narrow one, but it's not big enough to hold twenty-four ounces of a water jar. Thanks

Q: Is this a good bag to carry on plane to put under seat in front of you?

Yes, absolutely and there are still room to straight my legs . I love the bags, so many pockets, easy for me to organize things. Best travel bag for a good price. Well made , functional and pretty bag!

Q: is this bag 17 x 5.3 x 13? is it durable? what is the lining made from?

The bag I received was about 13" X 13" X 5.5" if to measure it like a box. So the base of the bag is about 13" X 5.5". If the base is collapsed, the bag measures about 15.5" in L (top opening, and a bit wider towards the bottom) and about 15.5" in H ...and 0" in W, which defeats the purpose of the side pockets. The lining seems to be a thinner type of nylon or polyester. There was no tag with the info on the fabric content; my bag had a little tag inside with a number 3 on it.