Hiking with pets means bringing some kind of container to hold food and water. Ideally it's lightweight, easily attached to a pack and easy to store. The Staruby collapsible pet bowls hit all the right notes.
The inexpensive bowls are BPA free, collapse to about a half-inch thick and come with a carabiner to attach to the outside of a pack. Two colors make it easy to consistently use one for food and one for water, and the size – about 4.5 inches across the top and 3.5 inches across the bottom – are perfect for any size pet, especially since they're deep enough – about 2 inches – to stuff quite a bit of food and water into.
When not being used for hiking, they're easy to attach to your pet go bag – you do have one, don't you? A little emergency food and water plus these bowls will do the trick for dogs, with a small carrier to round things out for cats. You can't beat the price and functionality.