Is it safe to use non-Apple adapter to charge Apple devices? Is it safe to charge your apple devices with an international adapter with multiple slots like this one?

Travel Adapter, All in one Worldwide Power Adapter Travel Plug, Fast Charging USB Type C, Smart USB Ports, Auto Fuse, International Plug Converter AUS, EU, US, UK, 220 Countries, AC Power Wall Plug


My concern is that this non-Apple adapter seems to be very compact, whereas Apple adapters seem to be much bigger.
I have iPhone, iPad, Apple Watch and Apple MacBook Pro. So I plan to use the adapter to charge all of these devices, potentially at the same time.
international adapter from Amazon
Is it safe to use non-Apple adapter to charge Apple devices?


Possibly.  

There's an old consumer's adage... You get what you pay for and it's especially true when dealing with (expensive) Apple gear.  

You've listed a number of "specs" but specs mean nothing in terms of quality.  The question is, do you want to plug your $3,000 USD MacBook Pro, $800-$1000 USD iPhone and $500-$800 USD iPad into a discount 3rd party charger?  

Cheap chargers can wreak havoc on your expensive gear - if you can't get a genuine Apple product, get an adapter that's MiFi certified - at least you know that they have gone through the effort and cost to become certified by Apple that their products are compatible.