Leather would be the most durable, and waterproof.
The Briefcase kind, obviously...
"This depends on what kind of briefcase you purchase. Most of the Tumi briefcases are made out of a leather type of material, but can also have a mix of polyester."
crane
The McKlein V Series Morgan Briefcase has a brass latch.
A lawyer would probably need a briefcase contaning evidence.
A suitable briefcase would be one that keeps materials organized, easily accessible with accessories such as a phone holder, separate area for your laptop, pen case and shoulder strap for convenience. A nice briefcase can complete your image as a serious professional while providing you with organization and accessibility of needed items.
The speed of light depends on what kind of material it's traveling in.In vacuum, the speed of light is 299,792,458 meters per second.In any material, it's somewhat less than that, and it's different in every material.
Manmade material
Containers can be made from various materials, including plastic, glass, metal, and paper. The choice of material depends on the purpose of the container and what it will be used to hold or store.
To ground is to eliminate any kind of electrical spark from traveling to or from any kind of equiptment.
The ostrich is one kind of bird that can hold a life long relationship.
The speed of light varies depending on what kind of material it's traveling through. It's fastest when in vacuum, and it's different, and slower, in air, water, alcohol, oil, glass, jello, etc.