When going out for a photo walk you don‘t always want to be encumbered by a backpack, especially if you are taking minimal gear with you, a camera sling is a nice compromise.
I have bought filters from K&F Concept for some time now and always found them to be of good quality and a reasonable price, so when I was offered this to review this bag from them I jumped at the chance, I wasn't paid to do this and this is my honest opinion of usability and quality.

The bag is well made with possibly the strongest internal pads I have ever seen in a bag of this size, perfect for keeping a small camera and a pair of lenses both protected and in place.
There are 2 main zipped pockets that provide ample space for a phone, spare batteries and the other odds and ends you generally carry around when on a photowalk.
The outside of the bag is wipe clean and I'd definitely showerproof, I took it out yesterday in light rain and had no issues with my kit getting wet and imagine it could probably take a heavier downpour without breaking a sweat.

On the underside of the bag are the obligatory straps for a small tripod, whilst I tried mine for size it isn't something I normally have with me on an urban shoot which is what I feel this bag is best suited to so I can't comment on how comfortable it would be to carry with one attached a full days shooting.
With the kit shown in the photo though it was very comfortable and for once I didn't get any neck pain, something that can be problematic with small camera bags.

Whilst I haven't used it for my drone yet I can confirm that it easily takes my Mini 3 pro, 4 batteries with charger and controller, and affords more protection than the OE drone bag.

Would I recommend this at the current asking price of £29.99 (with voucher)?
Most definitely.