My list
■ Pump - assume it's a mini one, strap to frame. Or replace with co2, which is smaller
■ u lock - depends where you're leaving it. I don't bother on my weekend bike, but do on my old hackerthat I leave at the pool...this will be most of your excess weight
■ repair kit - leave at home, 2 tubes should do
■ 2 inner tubes - keep
■ chain links and chain tool - I wouldn't bother, take a twenty for a taxi
■ gloves - wear or leave, unless you're commuting and the weather is hugely different start to end
■ purse - take credit card and cash, leave the purse itself and all the gubbins I bet you have in there - library card etc
■ keys - I have a set that just has bike lock keys, and garage keys (garage to outside and garage to house)
■ first aid kit - wouldn't bother...have you ever used it?
■ multi tool - keep, assuming it's lightweight...Allen keys are pretty handy
■ gaffer tape - wouldn't bother, though could be a plaster if you ditch the first aid kit
■ cycle glasses - as gloves, wear or leave
■ cable lock - as main lock, do you really need it?
■ helmet - up to you
■ Basket - do you need these bags? I have a seat pack that fits in tubes, co2, levers and everything...I put keys in zipped Jersey pocket and phone in main Jersey pocket, otherwise it all fits in
■ Backpack - as above
■ phone - pocket
■ Rain jacket - wear or leave? Get a really light one
■ waterproof cover for basket - ditch the basket, ditch this
■ Spare light batteries - fair enough, if you're traveling at night...I nearly ran out ten miles from home, with no spare which was bloody scary
■ lights/computer etc - essential for dark
■ Underwear when I take cycle shorts off - commando? Though assume not much weight
■ Inhaler - probably keep!
■ Ladies things ( time of month ) - fair enough