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We have an old Coleman Rigel X2, which is cheapo tent that weighs under 1kg, basically a single-skin hooped bivi for 2, plenty of condensation and not exactly much space, but survivable for a night. I don't think they make them any more unfortunately, they were quite unbeatable for a cheap AND light tent. The Laser Competition 2 is very popular, over half the tents at midcamp? These do seem to get sold off on deals every now and then, I got a factory seconds one for cycle touring after a tipoff in the lightweight tent thread, which could be a good source of more advice. I just had a quick look for any deals and found a Laser Competition 1 for £180 but no 2s.
(Talking of tents, you might have worked this out already, but a good tip worth mentioning is to take any old bigger tent for Friday night. You can leave this up while you race, then you don't need to pack up on Saturday morning and your race tent stays dry if it was a rainy night.)
The lightest stove option is the solid fuel option, I think. I've not tried those, they seem like they might not boil water reliably, does anyone know any better? I do like drinking a few rounds of soup and noodles in the camp on Sat afternoon, so have stuck with a gas stove and refined it down to -
- 100g gas cylinder, has enough gas for 1 night and enough left over to pass the kit check afterwards if that happens
- A micro burner, eg Alpkit Kraku claims to be 45g but we got something off ebay that's very similar
- A titanium pan, but leave the lid and take a piece of foil instead
- 1 spork and share it
- And eat out of the pan, or directly out of those foil bags of dehydrated food
- 100g gas cylinder, has enough gas for 1 night and enough left over to pass the kit check afterwards if that happens
I've done a Saunders and 3 LAMMs. I've seen a couple of blog posts about kit that I thought were good, no doubt from fast runners (definitely the second one) but nonetheless I think you can be inspired by these blogs and set yourself a target of getting close. It helps so much over a long day on rough ground, not just the weight but the volume of the pack swinging about too. I go for under 5kg without water in a 20l rucksack. Then collect everything you want, weigh it, and begin thinking creatively about how to cut it down to reach that target!
https://theomm.com/how-to-do-a-mountain-marathon-with-a-14litre-pack/
https://jonathanalbon.com/2018/10/30/the-omm/