The folks at GORUCK are well-known for producing military-grade bags, the sort you'd typically want to carry a lot of stuff in. But they've also got a line of smaller, more streamlined bags they've dubbed Bullet Rucks, for those single-day excursions on the trail.

Each of these three "day rucks" — sized at 5 L ($95), 10 L ($175), and 15 L ($195) respectively — can hold one of GORUCK's Standard Source Hydration Bladders, along with some small items. The two bigger bags (which are perfect for the GORUCK Light challenge) are large enough to hold some clothes and survival gear, but they're not designed with laptops in mind — they are purely for outdoors use. All three open flat for easier organization.