Ive found the 6L sling being a good compromise between the 3 and 10L version. It works well with a mirrorless camera plus one big and two small lenses, or tow big lenses.
Got this for a recent trip to Asia and worked out great. Love that it's waterproof for worry free rain activities. It's a snug fit for my Fujifilm XT5 but worked out great and with enough room for my wallet and phone.
My peak design sling 6L it’s completely awesome, you can feel the quality of the product when you see it, If you are looking for a sling for travel/work, this is the product you need, the quality and the product it’s just awesome
I’ve now had the 6l v2 for over 1.5 years. It’s good for carrying a mirrorless camera with a mid-range zoom and a few other items. It is well built and there are thoughtful design touches, as expected. However, I often find myself reaching for an older, cheaper LowePro sling which has a water bottle holder and a bit more space. So please add a water bottle sleeve or attachment to make this sling much better! An expandable front pocket would also be useful in place of the flat one.
I have been using a 10L Everyday Sling for a number of years and it is perfect for my Fujifilm X-Pro2 kit. It holds the body wth an attached lens and 5 additional prime lenses, in my case the Fujinon 8mm f/3.5, 14mm f/2.8, 18mm f/1.4, 23mm f/2, 35mm f/1.4 and 56mm f/1.2 (2nd gen). In addition, it holds my iPad mini and some other accessories like spare batteries, memory cards, a USB power bank, and a set of extension tubes. The design and construction is excellent, especially the dividers with the flip-down lens shelves - brilliant!
I bought the sling to be able to have a small camera bag but big enough to carry all I need for travel. Bag is lightweight and easy to carry. Excellent product!!