Only thing I don't like about a Sven is the small throat toward the front, which greatly restricts sawing through anything over a couple inches diameter.

On the other hand, anything sizeable is going to take forever with most folding saws.

Bow saws are low cost and can be had in a 21" blade size, which could be lashed to flat handlebars underneath, with a good blade guard.

More expensive but folding compact is the Lee Valley Agawa Canyon saw, with 21" blade, and has a deeper throat the whole length than the Sven. Not cheap, $82:




My own personal multisaw is a really fantastic Lenox high-tension hacksaw frame, with a 12" bowsaw pruning blade fit to it, I only needed to round the blade ends with a grinder. This is a photo from online and not mine, but it's really great with the wood blade. A bit longer blade and frame would be nice, but I also want to use standard 12" fine, medium, and coarse metal blades, and a diamond impregnated blade, all of which fit in the top beam, along with the deep wood blade:



EDIT: There are copies of the Lee Valley Agawa as shown above but with 12" blade instead of 21", on ebay new, for $22 with free shipping. I'd look first to see if same can be found on Amazon, as returns are free and without trouble to them, versus ebay. There's also the back-tension type frame, some listed in the same ad on ebay, also an option, but make sure you know which one you are getting. These are a great price, but a 21" like the Lee is going to cut a lot easier and faster than a 12" blade.