I have done a lot of Mtb with a trailer, have one with suspension etc.
you really can take them very "interesting" places once you get the hang of it but the way they push you through corners etc can be very iffy-allso a major pain if you have to push or carry the bike due to bridges/slips etc. the small rear wheel can really get hung up on stuff that the rest of the bike just rolls over.
A pack is really not ideal as it throws of your balance on technical sections and most packs are not intended for carrying loads in the position you are in on a bike-especially in technical sections. You may also have issues with the back of your helmet hitting the top of the pack at just the wrong time.
If you think you only need 30l in total a normal sized 10-15 Mtb hydration pack and one rack or bag on the bike should do the trick.
Keep in mind that regardless on what method you use that you will need to adjust your shocks to make up for the extra weight
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