Hi @neilhaj,
presumably those documents and travel details were emailed to you from vendors/organisations you have accounts with (assuming you weren't able to deal with them anonymously as a 'Guest'). As such, reach out to them/log on to those accounts and request they resend them (to an alternative email account if possible). Most organisations I deal with recognise that issues happen from time-to-time and should readily accommodate your request. Good luck & I hope you manage to retrieve all you need...
Then, as VMCopperUser suggests, Print to PDF and save to the various devices* that you'll have at your disposal, as well as online accounts (I use Google Drive & One Drive). Devices crash, break, run out of battery or, worst case, are lost/misplaced/stolen; networks become unavailable, application servers go down, all at the most inopportune moments, so it's always best to build in some redundancy suitable to your level of acceptable risk and the value/importance of the data in question. In many cases this will mean actually printing off hard copies too (overseas travel for example).
*I save to SD Cards on our mobiles/eReaders because I can take them out and insert them in another device, if a device loses battery charge or breaks...