I have a Tamrac backpack that measures 12x9x6. It has a tab on the side that says 4281 which might be the model number. It has a main compartment with padded adjustable dividers, 2 zippered mesh pockets in the inside cover. I think you could fit the camera with lens attached and the smaller lens. There's an outside zippered pocket where you could store the Kindle Fire. Two mesh outside side pockets would hold a water bottle and such. I would pack the battery charger in my checked luggage.

My bigger backpack is a Tenba. It measures 16x12x6. It has 2 main zippered compartments. I put 1 body with lens attached in each of the compartments (2 ready-to-shoot cameras). There are inside compartments as well - one would fit your Kindle. The others can be used for storage cards/batteries. This one also has outer pockets for water bottles. There's also a bottom zippered pocket with a rain cover in it.