Stainless steel travel mugs have become a status symbol in many offices. Metal mugs have become so popular, that they are often imprinted with the names of ball teams, luxury cars, or even cartoon characters so that users can enjoy a product linked to their favorite brands. Still, many people balk at the higher price charged for metal mugs. While slightly more expensive than their plastic counterparts, these mugs generally offer much better benefits.

Everyone knows all mugs are not the same, but in fact, most don't know how widely different brands and models can vary in features and quality.

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The differences between plastic mugs and metal mugs are well-known, but less well-known are the differences that exist between different models of stainless steel mugs.

For instance, not all metal mugs are double-walled for insulation. Even among those that are double-walled, there are many different types of insulating materials used to fill the space between walls. Some mugs use a dead air space while others fill this area with foam or some other insulating material.

The best travel mugs (metal or plastic) use a vacuum insulation system, which draws a vacuum in the space between inner and other shells much as insulated bottles do.

This double-walled vacuum-insulated construction can result in few or no condensation rings left on furniture when the mug is used to hold a cold beverage in a hot and humid climate. Anyone who has enjoyed a cold glass of lemonade on a hot day has noticed condensation on the outside of the glass.

That condensation is what makes the glass wet on the outside. When you set a glass covered with condensation down on a table or other surface water will often run off and leave a ring where the glass was setting.