Fantastic backpack for daytime activities and travel. We just finished a two-week trip to Europe from the States and we bought this backpack for my wife, while I purchased the 35L travel backpack. The combination of the two (along with our carry-on suitcases) was perfect for the trip. The 31L PRVKE was better for her size and easier for carry while we could load more into my 35L travel backpack.
The backpack was highly functional with thoughtful placed pockets and zippers. The ability to separate the lower part of the backpack and the top compartment is especially helpful for organization. We used the 31L PRVKE as an our primary day-trip backpack on hikes, to the beach, and while exploring towns.
The only improvement we can think of would be to include the security travel zippers on this backpack that are included in the travel backpacks.