They come in both canvas and gaberdeen. The canvas seems to work better. If you plan to sleep out spend the money and get one in good shape. WW1 and WW2 styles available. Austrian Y-strapes can be converted and are ok but repro ones are not too expensive and are better looking.
Original ones are nice but early post war are identical.
There are many patterns for these. The post war East German are acceptable. It also has two leather strips at top and bottom that can be buttoned to your uniform. Another one of those rarely used items that looks good. Like most items there are numerous patterns.