I own a Polaris Bike Pod which is an EVA foam case. At 6.8kg it is lighter than a hard case which is helpful keeping excess baggage charges to a minimum and offers close to the same protection. With bike, tools, shoes and helmet plus spares it ends up around 19kg packed.

You do need to remove pedals and seat post plus rotate the handlebars. As an extra precaution I do remove the rear derailleur... It does fit in the back of a medium Euro hatch with the back seats down, so you do need to be a little selective if hiring a car.

Biggest downside is manouvering - the molded handle makes walking with the case awkward, though I tend to loosen the front strap and hold this and managed okay walking some fair distances to accommodation if travelling with public transport.