I run a scouting Venture Crew and we highly encourage ultralight backpacking. As a result, many have ultralight packs from Gossamer Gear (Mariposa) and I have a zpacks pack.
We need a way to ocassionally add additional gear and have a small pack for summits or day hikes from base camp. My older Osprey Aether has a great removable “brain” that provides just what we need – not that Osprey’s solution is perfect, but it worked. Remove it, add a couple water bottles, rain gear, lunch, ready to go.
Any suggestions? Ideally dyneema type fabric for fy zpacks pack, but for the Mariposas – anything goes … I did look at zpacks multi-pack but it’s tiny!!