Yes they are very light james unbelievable actually for a 10 amp/hour, I've had one awhile now and just slip it through a standard trouser belt, I use it for my 100w blitz and the 50w lance on the gun, they are a lot more comfortable, but yes there expensive, its like everything you pay for the added benefits, Hippychick off the site has also got one, I'm sure she prefers it over the weight of the lead acid belt packs, being a Laydeeee!