K25! I need a shoulder strap.
Plus I don't carry too much around with me and I've found that this size is the best for me proportionately.

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I'm curious, what about the b25 edges it above k25 for you? As somebody who owns neither yet I'm curious. ^_^I like this question. If I could only have one H bag that means I can have other bags for other things. Therefore the bag I love to carry the most is my b25s. Very close 2nd is K25 because of shoulder strap, but it goes up my arm so much easier than a B25 when not using the strap. There are other bags from other brands that can be used similar to B30, and other totes for B35, and other brands that have cute classic shoulder straps.