Really depends on the track and you. You are making your centre-of-gravity much higher with the pack and you might find this becomes an issue on technical sections of the track. I don't like having anything more than a really light day pack with a water bladder on my back when I am on the bike. The Freeload bike racks (now owned by Thule) seem to be a popular option for carrying a bit of a load on a MTB but I haven't used one myself.
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