| 摘要 |
A backpack that has straps which may be repositioned, removed and replaced is designed to reduce muscle strain when the bag is carried by improving the balance of the load. Re-positioning the straps can enable a person to re-position the load closer to the center of the body to reduce the leverage exerted by an unbalanced load. An additional feature is that removable straps can be interchanged or replaced inexpensively with other straps that have different colors, trademarks, advertisements, or other indicia of support or affiliation. An advantage of the methods and apparatus shown is that the cost of replacing straps is inexpensive compared to the cost of replacing a backpack. The lower cost may make it possible for a business to furnish straps bearing its indicia as promotional items at a cost that is comparable to the cost of baseball-type hats, calendars, and similar items.
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