What about camel backs? I've had mine for years for hiking, but I don't sweat nearly as much hiking as I do cycling. I checked inside for washing instructions but I didn't see any. I was thinking it'd be ok in the washing machine on the gentle cycle, or I could hand wash, but I loathe hand washing. Has anyone had luck putting theirs in the washing machine? (And just to be clear, I'm talking about the outer pouch with straps, not the water bladder!). Thanks