The space left from the GPR single exhaust conversion cries out for a tool tube. Now I'm a bit of a numpty when it comes to manufacturing but I thought I would give it a go. 90mm pvc drain pipe painted black & coated in pvc wrap. I used a simple 50mm U shaped metal bracket fixed to the rear exhaust mounting hole (to get the tube facing slightly outward at the rear). A 100mm drainpipe bracket wraps the 90mm pipe snugly & offers a fixing point to connect to the small bracket. A curtain rod bracket with some thick handgrip foam slides over the exhaust hanger at the front. A couple of pop rivets, a couple of nuts & bolts and it's done. I took it for a ride on some corrugated gravel roads & it held up fine.
What's in it? Question, what are the end caps? Can you show some details? The stuff I can get is bulky as all hell, but then again I am using ABS drain which is fairly heavy. Probably stuff a tube, patch kit, pump, irons, matches, small amount of hand cleaner, rags to stop rattle.
The plastic is pretty thin really. One push on end cap. A threaded adaptor... Then the threaded end cap... As far as what goes inside… 1 tyre iron, 2 tyre spoons, 24mm wrench, bag of small tools (wrenches, sockets, allen keys, chain links…), a small spade, tube repair kit, tyre lube, plastic bag & rag. There is also a bit of foam filter stuffed down the base to act as a shock absorber. It all packs in tight so there is no rattle. I'm carrying my spare tube in my camelbak or another bag depending if I'm taking a pump or small air compressor.