Smallest refill tank for marauder

Ok for my semi auto marauder, what is the smallest tank I can use for refilling in the field? What would you guys recommend I get?

thanks 


After doing lots of research on bottle size and air gun tank size which is commonly 50cc 150cc 250cc bottle sizes at 200bar the small tank I went with was the 1.6liter hatsan tank (98cubic inches or so) on amazon for $250 This was the smallest size I felt would be easy to transport and compact but give me enough refills for a fun day out shooting that I would get plenty of shots out of. This will refill my 150cc gun tank up 16 times, 30 shots per fill x16= 480 and that is a full tin of pellets and a very long day at the range. That is going from a 4,500psi bottle and refilling my gun at 2000psi up to 2900psi I get 16 refills. On my 50cc pistol tank I get something ridiculous like 50 refills which equals 1000 shots for me.

So I chose the 1.6l because it gave me the best amount of refills in a compact size and the price of the tank with the fill valve was about the best out there. This tank will be used when I don't plan on shooting a lot, or a day at the range, for hunting, camping, plinking etc when a small lightweight bottle to take on the road is beneficial. If I didnt have a compressor I would only go with the largest bottle since I would have to pay to have it refilled and the smaller it was the more often id have to go get it filled and pay for the refill, here it doesnt matter if its a 3liter bottle or a 9 liter bottle the scuba shop charges you the same price to fill them. 

I also went with a 9liter tank from Acecare that is due to arrive soon, the tank and the valve was $330 shipped from china. The 9 liter tank gives me 95 refills on the same 150cc rifle tank and I get 280 refills on my 50cc pistol tank.

https://amzn.to/2XcTH3i here is a link to that hatsan bottle, the acecare bottles can be bought right from acecare on the aliexpress website. But the acecare bottles you have to plan on filling yourself, the hatsan bottle you can get filled anywhere. I will use the 9l for here at home where I shoot the most. Run my compressor for 20minutes one day and ill have a couple weeks if not a month worth of shooting before having to refill it again