Film holders are 2-sided so you have double the number of sheets as you have holders. Most people don't find this much of a problem because large format work tends to go much slower than with a 35mm or medium format camera. I have a dozen holders but most of them sit unloaded most of the time. I tend to carry 3-6 at a time.
If you go away, you would need a 100% dark means of loading and unloading film. For most, that is a dark bag or a dark tent. The tent option is slightly more expensive but vastly more pleasant to work in. Keep your old film boxes and when you take a trip, you can unload exposed film into one of the old boxes and develop it when you get home. Keep the cardboard insert and black bag from inside the box, too. Use it all, because the time you don't the box will get cut or crushed and the negative of a lifetime will invariably be the one inside. Ask in the classifieds here if you need a few empty film boxes before you've shot your way through them yourself. There's a good chance of somebody fairly nearby (I know we have French, Czech, German, and Italian members, as well as numerous others from further out from you but still in Europe.) being able to send you a few for the cost of post.
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