I've bought a couple of HBC's extract kits as a step up from kit brewing.
I'm planning to split them in half and do ~12L batches - what's the best way of storing the leftover hops & grain once I've opened the packet? I assume the grain just needs to go into an airtight container, but should the hops be frozen? (they're leaf hops I think).
Freezing your hops is best, preferably in an airtight bag with all the air pushed out, so that the hops are not exposed. Having said that, I normally keep open bags in the fridge, with little ill-effects. Though I do go through the hops pretty quickly.