It's not a Canon, but...
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I have a book from Ralph Clevenger and he recommends trash compactor bags and that's what I carry in all of my bags. I don't know if they sell them in Europe as I don't remember seeing a trash compactor during my years living there. They are 2.5 mils thick which is very heavy duty, but they fold up very small and are reusable and I mainly use them as ground cover to sit in the mud, but they also serve as backup waterproof gear covers. I'm sure you can probably find something similar in Germany.
24-105 is practically useless for wildlife
I have a completely different perspective having done the northern Tanzania safari circuit as the OP is going to do. I found the 24-105 to be the perfect lens for times when the animals were close to our land rover, which was pretty often.
just lift bro
I may be naive but it seems like you can have a one lens solution in the 28-300L lens. It seems to be a perfect fit. Wide and long. Although heavy at 3.7 pounds.
I just returned from a trip to Namibia (a little different from tanzania). Like you I had questions about the gear to take with me. In the end, as many members recommend, I went with 24-105mm and 70-300mm. It covers almost all my needs. You can take a look at some of my pictures if you want!
Personally I prefer the 70-300mm than 100-400mm especially concerning bokey (and weight)
Hope it helps