As normally the Chesirecat stole alot of my ideas or good advice lol and think you got some other good responses. But the need to restate it's better to over pack than under for me its prepare for the worse pray for the best as the cat mentioned depending where you are running out can suck or with luck I have, others would run out with an abdl store near by or someone that has high quality diapers me it's happen in podunk fortunately I did research see below. Also will mention below but Incase I forget my situation is tad bit different I am paralyzed so for me I do things slightly different.
So for me it honestly comes down to where I am going, so for example I am leaving technically today for Christmas break at real families house(I only have one blood brother but I have many not related family members) it's like a 3-4hr drive but being a holiday usually factor in double the time so I do have special use diapers I use for traveling(like the cat mentioned high absorbent). But besides traveling and potentially something else I really don't see the need for that many special use diapers so this trip I probably only need one special use and a booster but pack for worse case so 2 out 2 back & another 2 for just in case, because I am away from home I tend to follow my work or going out protocol which is daily diapers and boosters because though staying with family changes might be hard so on avg I use 6 diapers per day & 2 booster but days I work it's like 5 diapers 5 boosters worse case planning this trip I have packed for 5 days even though going for 3.5 usually pack 1-2 days more than needed. 6x5=30 diapers to make it easier my boosters are 12 per pk so packed 2. But I should mention I do have my daily diaper bag which in it has 5 daily diapers 1 special + 6 boosters so technically packed for 6 days but because I have memory issues I usually over stuff diaper bag.
Though I have used the medical baggage flies free program in US only it's usually for shorter trips anything 5 days or more because I am paralyzed and have enough issues yes it cost more I will ship diapers ahead of me and usually pack a military duffle bag aka sea bag you can get at most surplus stores if you weren't issued one but I can pack extras for return trip for shorter trips if I am checking a medical bag it's usually the sea bag as it can hold alot and has good carry options (though I never had an issue if flying in the CONUS rules madate it can only have medical products or supplies through technically gray area I do keep a spare set of clothes in that bag if possible & if asked it's in case of leaks which technically is true but have had my luggage lost few times so it's a backup).My carry on since I travel with my service dog I haven't had an issue yet(knocking on wood) having 1.5 carry on bags so in my main carry on I keep 2 days of diapers change of clothes all my meds and random stuff like laptop and other stuff the half bag I keep all my service dogs food for the trip and few things for him and anything I need that I can't fit in my bag it's like my go bags we can survive for 2 days and if I did my homework should by me time (re-reading this I may sound little paranoid or like I wear tinfoil hats but I swear I don't. I have to worked in a few different careers where it's best to be prepared for SHTF it's like I carry bearings for my wheelchair and Allen keys I bet day I don't have them I will need them)
Also a thing I do if I am heading to a certain area which I might be in for a bit is 2.5 big things talk to the company where I order diapers from and see shipping time if I needed to get more shipped there, but I also look up medical supply places to see what they carry in stock(you must ask in stock some advertise things not on hand) here is the thing even if it's not something you normally use there is probably something you have used that could be used in an emergency, so for example one of the times my luggage was lost I knew I couldn't get a shipment overnighted but local supply place had something that was better than nothing. But where this also helps if you you can extend your trip so like the best I found was Abena though cloth backed, but have also found Tena & boosters I wasn't familiar with. So I basically worn the Tena & boosters when I could or knew I could change and rationed the extras I packed. The 0.5 I do have a backup company I occasionally order from that is usually good with quick shipping
As for water activity there was a recent post about this but short version Rearz, Incontrol, and think Protex have these latex type pants(
https://rearz.ca/transparent-seamless-latex-brief/) it's sort of like a $25 scratch ticket your a winner or thanks for the donation. Being rubber or latex they are made to be super tight and if they don't rip or break(being paralyzed getting them on is a task & half) they actually create a tight seal around your legs and waist when they didn't break or rip I was able to wear NS Supreme/L4/Dry24/7 with and with our boosters and had no issues whatsoever no leaks in or out. Not sure if it's the reason but old job I wore a drysuit with vulcanized rubber gasket around hands and neck and we coated them well with cornstarch based baby powder and I found those latex pants to be similar. I did get the idea from a great guy on YouTube but they admit when his wife helps him their less likely to have issues being single I have only had help once other times it's a small workout. I do want to add depending on your situation and another thing I tried & potentially be easier for someone without a disability there is a brand called SOSecure they are fleece like almost like a diaper cover I normally put a cloth prefold in it to get me to the pool also will take small voids but once wet it's getting wet and usually crack open leg hole as I am getting out to drain water out. But if a bathroom is sort of close or say on a beach or somewhere you can put a towel over yourself discreetly you could get a high absorbent pad and slip it in and out
Sorry for long reply but not easy post to answer shortly.
Hope your trip goes well and without issues. Also remember wherever you go unless it's a place you been before the chances someone will know you is extremely low unless you have my kinda luck, I am not implying to do anything irrational, but also don't be nervous enjoy yourself & have fun. It's like I did a long road trip(where I stopped was like 1000mi away from home) and had a Mommy Caren(legit ones start with that letter lol) repeatability knocking on family bathroom door, I may of taken my time with that change you can't rush them haha & mind you she more options than me, but she waited and of course she made a comment that bathroom for diaper changes, as I was in the doorway sort of rolling slowly I pointed to the w/c figure and was like see that thats a thinner me so it's for me too and I wasn't baking a cake sorry I have to change myself but if your heading same direction and want to help me next time I can call you she didn't say anything as I rolled away(if I was anywhere close to home I may of made a comment of it being a disabled bathroom which I do anyways or some sarcastic reply.)
