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How do the personal needs bags/zones work? I've been reading the IMUK website, and, being a novice, I'm not convinced I'm following it properly. What are you allowed to have in your bag (which is presumably left on a station on the bike course?) and on the feed station on the run course? And do you just have to grab it yourself, or does someone pass it (whatever it is...) to you?
And just in case someone knows - what gels do they use for IMUK?