Slotted as a clever lightweight option within the Marmot line, the Kompressor 12L Daypack is one of our go-tos for travel and spontaneous hikes thanks to its packable design. The whole backpack zips into a self-stowing internal pocket, packing down to about the size of a 1L water bottle. This makes it perfect for chucking in our suitcase and busting out for day hikes once we get to our travel destination.