Well-thought-out organization, great volume & security
I have the Metrosafe X Anti-Theft 25L in tan. I am impressed by the organization it offers - much more advanced than in many backpacks advertised as designed especially for tech and/or organization freaks. I use it as a daypack but its 25-liter volume may be enough for a weekend or a two-day business trip. The material is slash-proof but very soft and pliable so it doesn't keep fit if not loaded but, on the other hand, it means greater adaptability. What I lack a bit is a sternum strap to redistribute weight when loaded heavily. Definitely worth buying.