Hard-cased lipos are all pretty much standard sized (stick, shorty or saddle sized that is). 'Soft packs' do not have the case to protect them, so you need to make sure that they are not in any danger of being damaged whilst in your chassis for racing, but they come in a massive range of shapes and sizes, with varying capacities....
Best thing to do is tell us what chassis you are using, and what sort of racing you plan to do.
Some championships or clubs insist on hardcased only, wheras the micro sections' nationals allow soft packs, but you are required to ensure that they are protected and fully secured inside the chassis.
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