A portable trash can (rubbish bin) is useful to us humans in many different ways, these include:
You don't have to find a bin
They are easy to use
And can be used for cleaning if you were to move it around and pick up rubbish on the floor.
The are portable.
Because it is portable
because it is portable
Portable audio players are highly convenient - they allow you to take your music, audio books, and podcasts with you wherever you go. They are relatively inexpensive and durable, too.
A typical portable dryer can be a convenient appliance to have, but some can be quite costly due to the portability convenience. A typical portable dryer costs between $250-$500.
One of the newest forms of portable gps navigation is now found on a watch. A wristwatch which can be easily worn is the most convenient portable gps device.
The TravelJohn disposable urinal is very convenient for travelers on the go, as it provides a portable and discreet solution for urination when access to a restroom is limited.
Estimates say that the answer to this figure is close to $4 million. Portable speakers are raging in popularity, and is extremely convenient with liquid sound.
A portable barbecue grill is portable - meaning, not stationary - and can easily be moved around from one location to another and is used for outdoor cooking. Additionally, modern portable grills have been designed to be collapsible for convenient transportation. Many people use portable grills for camping, picnics, tailgating and other outdoor parties.
Probably to make money. Why not? It's portable, convenient, and can be sold for a good price. Whouldn't that make money?
Yes. The new line of portable photo printers make it convenient to print on the go. Some are as small as a 3X5 picture and can fit most anywhere. With laptops so popular today these portable printers are the logical choice.
Portable generators, power banks, and portable solar panels are some common options for providing portable electricity. These devices are convenient for powering electronic devices or small appliances in areas where a traditional power source is unavailable.