I'm a big fan of both Lidl and Aldi so I always check out their cycling goodies which are cheap and not so nasty!
Those seat post bags seem similar in size to the smallest Topeak model but they are only a quarter of the price....and the Topeak ones don't come with any tools! I purchased one large and one medium bag from Halfrauds in their sale recently and find them just about perfect for my needs. Believe it or not, that much-maligned bike and car retailer was the cheapest source of Topeak bags at that particular time. That must have been a first!
If I need shopping or have any bulky stuff to transport, I use my oldest ebike which has huge pannier bags. I could move the panniers on to one of my other ebikes but I like to keep them light as they are both quite sporty in their set-up.
As for the sunglasses, when I checked out a couple of price tags in Halfrauds, very similar sunglasses had numbers such as 14.95 for example printed on them and the quality seemed pretty much the same as those from Aldi/Lidl.
Unless you're a supermarket snob, I recommend checking out our German supermarkets, particularly if you like decent wine without silly price tags.
Tom