Berghaus TwentyFourSeven 15 litre Daysack - Whether you're out for a stroll, off to college, or travelling the globe; the Twentyfourseven 15 Daysac is both stylish and practical. This handy and compact 15L backpack has a new, sleek design and is packed full of Berghaus features. The Twentyfourseven 15 is a 24 hours a day, 7 days a week, versatile pack.