This pack from Maxpedition is small enough to fit on the waist and large enough to carry everything you need through the day. There are multiple pockets and flaps to store any kind of item including phones, knives, flashlights or tools. The material is water resistant for extra protection.
Specifications and Features:
Designed to fit a 1 quart USGI canteen
Utility M 4 waistpack
100 cubic inches of carry capacity
Two small pouches with adjustable lids for cellphone, extra pistol magazines or pocket knife