I'm looking for a allround SUP mainly for flatwater touring and some small waves.
What would be a good length, width and volume to aim for?
I'm 70-75kg, intermediate ability.

I'm similar weight to you, and probably intermediate to advanced. Really depends on the shape for length- I like a bit more volume as I surf often decent size waves with lots of water movement around 100-105l. Length 7'2-8'4 (both of those have the same volume but very different shapes)

Flatwater touring , longer is easier . Flatwater touring , wider is easier.
ANY board will do small waves including most flatwater displacement boards. You are chasing pretty much THE most covered SUP board activity. Just avoid skinny and dugouts and you should safe.
Just get a nice light board with quality construction and you are there.
You don't mention how much you are going to spend or where you paddle most.

They don't make them any more unfortunately but if you can track down an Atlantis venom ( or even something of a similar shape / length / width ) that would be ideal IMO for what you have described .

That Atlantis board looks good, an allroand SUP would suit not a surf specific. Paddle mainly coastal waters.

Aiming for 30" board. Would a 33" board, 200 litres be too much in terms more width=decrease in speed?

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solar3 said..

Aiming for 30" board. Would a 33" board, 200 litres be too much in terms more width=decrease in speed?

33" will surf just fine, as long as the tail is pulled in, and will paddle fast as long as the length is there. 31 is probably a better compromise, with lots of stability, and speed, but 33" will really go with a longer board'. Too much float starts making things weird. While anything is surfable, the key to a wider, more stable sup that surfs good is that narrowed and thinned-out tail. Length is the key to a good touring board. Just as an example on what I want in an all-around shape, take a peek at the Blue Planet Fun Stick, Turbo or similar from any reputable brand. Longer, pulled-in and thinned out tail with hard rails, wider nose, no banana-like rocker.

At your weight i'd say yes 33" would slow you down considerably . For general flatwater touring over any sort of distance i'd suggest 30" or narrower

I'm 60kg dry in summer and i have the venom. It is very stable and actually too much board. I now mainly use it for onshore mush in bay / river inlet surf

Check the starboard wide points out . You can pick em up pretty cheap and they are rock solid. The 11,2 is my go to board and does everything i want . At your weight you could go to the 9 foot boards with out any problems. Imo steer clear of the pine and carbon varieties.

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solar3 said..
That Atlantis board looks good, an allroand SUP would suit not a surf specific. Paddle mainly coastal waters.

Aiming for 30" board. Would a 33" board, 200 litres be too much in terms more width=decrease in speed?

Hi solar

There are so many ways to enjoy what you are seeking that I waited for some replies to come in and get a better feel for what direction you were looking.
Everyone has different visions of how they prefer to use a board.

Check out the Sunova "Point Break" 12' x 32" 197 liters
Designed for max surfability, but the numbers make it a nice ocean paddler as well.
Purposed to reach remote points and reefs for quiet sessions!

I just saw a rave review on SUPboarderPro about the new Starboard Generation (12'6" allrounder) that my be worth a look. That online magazine tends to be less fanboy re: their advertisers , with their reviews, although you wouldn't know it from this review.
We have both a Starboard Widepoint(10'6x32) and a Wideride Whopper (10'x34"). The Widepoint isn't that great in the flat water as it has a fair bit of rocker and tends to push water in the flat , but is REALLY nice in waves once it is moving. The Wideride Whopper is actually faster in flat water despite the width and being shorter , as it is a LOT flatter, so has a bit more waterline length, and surfs VERY well in small to med waves ( I have been told even is bigger waves, there is some great vids on the Starboard site).
However I forgot to mention that for flatwater , less rocker is better. No necessarily K1 kayak flat , but as soon as you have a reasonable amount of rocker , you start pushing and sucking water.
Check out the Sunova Expedition as well if you have the money. 7sizes and , if looks are important, they are beautiful boards. The people that have them tend to become a bit cultish about Sunova, so I suspect they are reasonably good.
But as I said before. You are looking for THE most type of use and there is heaps of great boards.
Decide length ( longer is faster but harder to carry and store, if that isa factor), width ( for touring and flatwater stability ,28" or wider,26" is a mega stable design). price and reliability and you will automatically narrow it down, especially when you try to buy anything, as Aussie businesses usually stock stuff all. The last one I know , because I tried for 8months to get a Starboard waterline and noone had any intention of stocking them.

Check out the sunova pointbreak 12"0 x32