Yes it will fit in either, also nicely with a GSI steel cup with folding handles under it. I got the 40 with the optional flat top and D ring for extra room. I went with the 10x5 after reading many reviews from guys with the 10x4 that started adding pouches and too much outside. The 10x5 gives you more flexibility. I have an emergy bivvy, para, med kit, multiple fire starters, signaling, lighting, compass, poncho, multiple water treatments, food, plenty of room. With the extra width been also thinking about making a small hobo wood stove to fit around the KK 40 with the GSI on top.
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Java Dog, will the 40 KK fit into the maxped bottle carrier, either the 10x4 or 10x5? Looks like they should. I am wanting to get a couple of them. I have an 18oz I take to work every night and really like it. Plus them being steel, HOT WATER without having to break out another piece of gear if you need to heat up water.
