Milwaukee PACKOUT 22 in. Rolling Tool Box, 22 in. Large Tool Box and 22 in. Medium Tool Box ProSystem Low Profile Handle

A box (plural: boxes) is a container with rigid sides used for the storage or transportation of its contents. Most boxes have flat, parallel, rectangular sides (typically rectangular prisms). Boxes can be very small (like a matchbox) or very large (like a shipping box for furniture) and can be used for a variety of purposes, from functional to decorative.

Boxes may be made of a variety of materials, both durable (such as wood and metal) and non-durable (such as corrugated fiberboard and paperboard). Corrugated metal boxes are commonly used as shipping containers.

Boxes may be closed and shut with flaps, doors, or a separate lid. They can be secured shut with adhesives, tapes, string, or more decorative or elaborately functional mechanisms, such as catches, clasps or locks.

A handle is a part of, or an attachment to, an object that allows it to be grasped and manipulated by hand. The design of each type of handle involves substantial ergonomic issues, even where these are dealt with intuitively or by following tradition. Handles for tools are an important part of their function, enabling the user to exploit the tools to maximum effect. Package handles allow for convenient carrying of packages.

Milwaukee is the most populous city in the U.S. state of Wisconsin. Located on the western shore of Lake Michigan, it is the 31st-most populous city in the United States and fifth-most populous city in the Midwest with a population of 577,222 at the 2020 census, while the Milwaukee metropolitan area with over 1.57 million residents is the 40th-largest metropolitan area in the nation. It is the county seat of Milwaukee County.

Founded in the early 19th century and incorporated in 1846, Milwaukee grew rapidly due to its location as a port city. Its history was heavily influenced by German immigrants and it continues to be a center for German-American culture, specifically known for its brewing industry. The city developed as an industrial powerhouse during the 19th and early 20th centuries. Milwaukee is an ethnically and culturally diverse city, however it continues to be one of the most racially segregated cities as a result of early-20th-century redlining.

Milwaukee is rated as a "Sufficiency" city by the Globalization and World Cities Research Network, with a regional GDP of over $130 billion in 2023. The city is home to Fortune 500 companies Northwestern Mutual, Fiserv, ManpowerGroup, Rockwell Automation, and WEC Energy Group. Its cultural institutions include the Harley-Davidson Museum, Milwaukee Art Museum, Milwaukee Public Museum, and Summerfest, one of the world's largest music festivals. It is home to several higher education institutions, such as Marquette University, Milwaukee School of Engineering, and the University of Wisconsin–Milwaukee. The city's major league professional sports teams include the Milwaukee Brewers (MLB) and Milwaukee Bucks (NBA).

Rolling is a type of motion that combines rotation (commonly, of an axially symmetric object) and translation of that object with respect to a surface (either one or the other moves), such that, if ideal conditions exist, the two are in contact with each other without sliding.

Rolling where there is no sliding is referred to as pure rolling. By definition, there is no sliding when there is a frame of reference in which all points of contact on the rolling object have the same velocity as their counterparts on the surface on which the object rolls; in particular, for a frame of reference in which the rolling plane is at rest (see animation), the instantaneous velocity of all the points of contact (for instance, a generating line segment of a cylinder) of the rolling object is zero.

In practice, due to small deformations near the contact area, some sliding and energy dissipation occurs. Nevertheless, the resulting rolling resistance is much lower than sliding friction, and thus, rolling objects typically require much less energy to be moved than sliding ones. As a result, such objects will more easily move, if they experience a force with a component along the surface, for instance gravity on a tilted surface, wind, pushing, pulling, or torque from an engine. Unlike cylindrical axially symmetric objects, the rolling motion of a cone is such that while rolling on a flat surface, its center of gravity performs a circular motion, rather than a linear motion. Rolling objects are not necessarily axially-symmetrical. Two well known non-axially-symmetrical rollers are the Reuleaux triangle and the Meissner bodies. The oloid and the sphericon are members of a special family of developable rollers that develop their entire surface when rolling down a flat plane. Objects with corners, such as dice, roll by successive rotations about the edge or corner which is in contact with the surface. The construction of a specific surface allows even a perfect square wheel to roll with its centroid at constant height above a reference plane.

A tool is an object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task. Although many animals use simple tools, only human beings, whose use of stone tools dates back hundreds of millennia, have been observed using tools to make other tools.

Early human tools, made of such materials as stone, bone, and wood, were used for the preparation of food, hunting, the manufacture of weapons, and the working of materials to produce clothing and useful artifacts and crafts such as pottery, along with the construction of housing, businesses, infrastructure, and transportation. The development of metalworking made additional types of tools possible. Harnessing energy sources, such as animal power, wind, or steam, allowed increasingly complex tools to produce an even larger range of items, with the Industrial Revolution marking an inflection point in the use of tools. The introduction of widespread automation in the 19th and 20th centuries allowed tools to operate with minimal human supervision, further increasing the productivity of human labor.

By extension, concepts that support systematic or investigative thought are often referred to as "tools" or "toolkits".