I would leave behind the SAS survival guide book. Most of the advice in the book is for your hard core military types who enjoy making dead fall traps for squirrels, whilst flint napping some arrow heads for some Lord of the Flies encounter with a wild boar.
Good detailed set of personal hygiene products and FAK items listed though. Its important to keep neat and clean and fresh when bugging out if only for morale, although the synthetic clothing won't help much after a few days especially in hot sweaty conditions. I would also get a proper tent as good lightweight durable ones, which can withstand much more severe weather than any tarp are available and have the added benefit of keeping insects at bay during the night. Even Mr Wiseman would recommend this option for more long term comfort. Get a comfy Thermarest type inflatable mattress and a nice warm cosy down sleeping bag instead of the heavy cold fleece blanket. Get a lightweight gas stove and a lightweight Titanium cooking pot/mug for hot meals and beverages. These items would weigh about the same as the 20oz steel cup. Sometimes it is nice to brew up a nice cup of hot sweet tea inside the tent when there is torrential rain outside. Leave behind either the SAK or the multi-tool especially if your already carrying the buck knife. Bugging out should be as comfortable as possible rather than a SAS SERE survival course. I would be thinking more along the lines of conventional trekking/camping kit list for a BOB.