-
I've never taken a full set of allen keys when I take my bikes abroad, only those I need. And most of those were eventually retired when I got the Silca T-Ratchet Kit as for most uses, handlebars, stems, seat posts, brakes etc as it replaced the full sized allen keys and is a good rudimentary torque measure. I also swop out the bits in the Silca case to others which are more useful depending on the bike, eg one bike only has torx heads on the chainring, so I don't need the others. The only other really useful tool was a pedal spanner, but I'd often just take a longer 8mm allen key. Those things coupled with a decent leatheman pilers type multitool covered me for pretty much everything aside from the obligatory puncture repair kit. My entire travel abroad toolkit fits into something the size of a bidon, including spare cables, small bottle of lube, tire boot, tubes etc. And most of it I've never used, but it's handy to have if needed.
The cylinder is the most compact holder that I've seen, even more so than the Wera, which is why I'm interested in it.