Yeah, I agree about multiple containers. I originally bought the 10L for multi-day climbing trips with little to no water. I got the dromedary specifically since it could handle boiling water, which is a technique I often use to add warmth to my sleeping bags. There are some long ridge climbs which are cold and also have no water. The bags are often around jagged rocks, so I wanted the durable outer. I immediately regretted the decision once in use because it fits so awkwardly in a pack. For my use case, I don’t think the Platypus bags are durable enough. I’ve been using some DromLite bags lately which scare me but seem to work well. They’re still reasonably durable if I’m careful. Within the same model of bag there’s a significant weight savings by sizing up.
The 10L dromedary weights 10oz.
2x 4L dromedaries + 1x 2L dromlite weigh 18.4oz
If I had to do it over, for a water carry, I think I’d go with 2x 4L bags.
With regards to the lead warning, it’s on MSRs website under the description:
https://www.msrgear.com/water/dromlite-bags
https://www.msrgear.com/dromedary-bags
WARNING: Contains brass that can expose you to lead, a chemical known to the State of California to cause cancer, and birth defects or other reproductive harm. – P65Warnings.ca.gov
It’s possible I may have overreacted to this warning. It’s a little unsettling. If there’s no brass touching anything that you drink from, then maybe it’s not a deal breaker. The warning is not very clear about that, but it doesn’t take a whole lot of lead to be a problem around children and pets.