In reply to glenn0010:
I've not heard a lid pocket called a brain before.
I've got mixed feelings about these simpler lidless climbing packs. I like simplicity, especially when climbing, and I do use a couple of lidless packs a fair bit. But for me a lid pocket is still far from obsolete - especially since the small pockets offered on most lidless packs are really pretty poor. Stashing things in a couple of small stuff sacks is the best you can do if you're lidless, but they become a faff to get at so it's not ideal.
I'm not a fan of stuffing my clothing with odds and ends as it all adds to bulk around your body and it's nice to be streamlined (for want of a better word) when climbing. I'll carry a phone in a pocket and may have a compact camera round my neck so it's easy to reach but kept warm and dry under my top layer. Occasionally a pair of gloves or a torch go in a pocket if I'm imminently going to use them. When navigating off the top you clearly want your map/compass in a jacket pocket. But I don't want any of that bulk about me on the route. That's for the lid.
In a lid pocket I might carry any or all of these, for ease of access on the go: thin gloves, buff, hat, sunglasses, ski goggles, headtorch, map/compass, snacks, compact camera if I'm not planning to use it for a while. If all that lot has to live in stuff sacks somewhere inside my lidless pack then I inevitably end up spending more time retrieving it.