Being new to snuff, I’ve been placing orders of the smaller tins or tap boxes, because I’m obviously not sure that I’ll like them. The concern I now have is that these containers may not be airtight, which would mean the snuffs are drier and not as fragrant as they should be. My question: is it a better idea to just bite the bullet and go for a normal sized container or keep doing what I’ve been doing?
the only snuffs where id recommend a larger size over the smaller one based on drying out is samuel gawith and gawith hoggarth (and any other english snuffs in a tap box). getting an SG in a tap box usually means its dry before it even reaches you. as for getting bigger sizes in general, i would recommend getting 10g or 20g+ anyway, because if you dont like it you can either keep it till you might like it if its stored properly, or trade it on to someone else for something you want to try, thus saving money often.
All my SG’s were 10g tap box. They were dry, fine, sandy, well, I didn’t enjoy taking them, they just had good aroma. When I bought 25g metal tins… all has changed. They are awesome. I suppose there is the same syndrome with others snuff.
5g or 10g is fine for “sampling”, but my standard purchase size for consumption is 20g/25g. I transfer from this to a 70ml or 120ml bail top glass jar and use this to top up my daily snuff box. I have recently bought some snuff in bulk, and will be getting some larger bail top glass jars for these. In turn, these jars will be used to replenish the smaller glass jars, rather than loading my snuffbox directly I think the size of the container is less important than the amount of times it is opened. Every time you lift the lid you let out air and moisture and replace it with fresh air, which will in turn be infused with odour and moisture for releasing next time you go in. I’d suggest focus less on the container, and more on the system that best suits you. If you are only ever consuming small quantities of a snuff, it’s not an issue - it’s more when you have found your favourites. Find a way of managing your snuff so that it has the least exposure to air and light. Although as @Firestarter0 said, if the small containers you are buying are not airtight (such as tap boxes), you would be better off in increasing container size immediately if that means the snuff reaches you in better condition.
I always get bigger tins. Not because of freshness but it’s more economical. The small tins aren’t enough to even really get an idea how much I like a snuff.
That’s what I was afraid of with this Scotch SP and Blue Crest Scented, same with the Dholakia in the tap box. They all showed up rather dry and I kept reading that they were supposed to be more moist. I’ve gone with bigger tins and a couple snuff boxes for my most recent Mr. Snuff order, now I suppose I just need to work out a decanting system.
Good luck with finding out what works best for you. Considering the title of the thread, I’m rather surprised we managed to answer this without a single innuendo … 
The bigger the container, the lower the price is per unit volume. Well… per unit mass if you want to be technically correct!