I'm necromancing an old post here, but it's still a valid question in 2019, and this page still comes up in google searches.
I've been looking around for an airline compatible bag that fits the following requirements...
1) Can fit freediving fins, so 900mm long is probably a minimum
2) Doesn't need to be checked as "Sports Equipment" - which is double the cost of a normal suitcase - which means height x width x depth is less than 161inches (varies per airline. Easyjet is 275cm)
3) Is big enough to hold clothes, shoes and other holiday stuff
3) Is preferably wheeled
4) Doesn't cost a fortune
And I have come up with a solution... at least for the UK and certain other countries
A cricket bag. Yes, cricket, the 4 day long game played in the 4 corners of the old British Empire.
Check out this one... 920 x 330 x 280mm and wheeled. 85 litre capacity (medium sized suitcase I think)
Explore a wide range of high-quality cricket and hockey equipment, apparel, and accessories. Find your winning edge with our expertly curated selection. Shop now for top-notch gear and elevate your game!
www.cricket-hockey.com
And only £30
There may be alternatives that are slightly longer, but it's a good place to start looking
I haven't bought one yet, so it may need some plywood and foam pipe insulation reinforcement, but I was so excited about this find, I had to share!