I need a water bottle that doesn't leak - aargh!

[pigsinmud]

Ok ds1 has come home today with yet another leaking water bottle - bag and homework book soaking wet. Please tell me of one that lasts for more than 2 months. They have to have a water bottle in the classroom. I've tried Sigg - ds2 has one and it leaks. I've replaced the seals and it still leaks. I've tried loads and spent a fortune.
HELP!

this is the best one I have found. never had a problem with it leaking

I know it's a lot to ask tmmj, but I'm going to find it! Thanks whoops I'll have a look at that.

water bottles not allowed in book bags is my rule. Been there one too many times.

He's in yr 5 he couldn't possibly walk down the road carrying a book bag It was in his rucksack, which has a book bag in it [rolling eyes emoticon] and the water managed to seep through book bag and onto homework book.

I agree - keep water bottles out of book bags!

sigg

pricey but worth it