Ruff Wear's Approach Pack™ II is a multipurpose dog pack suitable for daylong trail outings and overnight summer trips. The X-small size has 280 cubic inches of space for treats food a collapsible dog dish and some pick-up bags. Small size has 644 cubic inches of space which is more than enough for overnight adventures. Depending on the length of your trip you can carry the dog food and your pooch carries everything else.