They are awesome trolling bags. I've had a set of buggy bags for 4 years and they hold up. 42" across is considered the 28" bag. I use 2 for my 27' Baha to slow it down to 2 mph
You may want to read the MSDS sheet, it contains acids. "This cleaner is not for use on wood, fabric, natural stone, aluminum, brass, chrome or painted surfaces." "The Works" contains acid also.