Reddit reviews Ceptics International Worldwide Travel Plug Adapter 5 Piece Set, Great for Cell Phones, Battery Chargers, Laptops to Work in Most Countries

I actually went in the opposite direction, favoring compactness over convenience. I just use a 3-outlet tap combined with the power adapter for whatever country I'm in.

I've never had issues fitting things on the outlet tap and it packs up to a tiny size.

Ive been in one hostel in 4 months that had USB power outlets. Simply put, no hostels dont offer this. Just buy adapters now cause theyre cheaper on amazon than in the stores. I guarantee you will be buying them within a day once you get to your destination.

I bought a pack on amazon for 8 bucks that has all the adapters you will need in every country you go to.

Id say ditch the solar panel (unless you plan on camping a lot) and keep the USB battery pack. Battery packs are extremely useful if your hostel is short on plugs or youre on a long train/bus/plane that has no outlets.

I looked through all the comments so I'm pretty confident this hasn't been mentioned yet.

Something I always travel with is an outlet converter and a small portable power strip.

This combo really come in handy when you need to use more than one outlet at once (charge a phone, laptop, and digital camera battery, etc.), especially if you're traveling with another person.

I have both of the items linked, and neither take up much room in my carry on luggage (I have an Osprey Porter 46). They're easy to tuck away in a nook, and the power strip's prongs fit into itself, eliminating bulk.

These could go really well the the battery pack many have suggested. Gotta keep all those devices juiced up!

Plug adapters:

I have 3 of these kits:
https://www.amazon.com/gp/product/B00E0P2GLM/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I will tend to just bring one of the zipable bags with the relevant plugs for my trip. You will need UK and Euro plug adapters.

Inventory all the electronic crap you and your wife have. How are you situated for spare cables?

Basically, a lot of Euro hotels don't keep the power flowing without a keycard in the room, so you need to do all your charging at night. Don't incur stress because you are short a plug adapter

Camera - if you are bringing a DSLR, are you situated for batteries and SD cards?

I pack a collapsible umbrella and a rain coat. When I was more of a backpacker, the rain coat was rollable into a pouch.

Drugs - along with toiletries, I have a bag with Immodium AD, sunscreen, antacid, ibuprofen, bandaids(plasters).

I am not one of those carry on only people.

There are four potential problems.

• The difference in voltage. Bangladesh is 220v 50Hz as opposed to 110v 60Hz in the US. Check that your electronics are okay with this -- most are but it's generally in tiny writing on the transformer. If you're electronics aren't okay with this, then you need a transformer to convert the power to 110v (your electronics still need to be able to handle 50Hz).
  
  
• The shape of the prongs. You can get one that tries to do everything, but I prefer ones like these and just take the one I need which is smaller and more reliable. Most of the AAA stores sell these.
  
  
• Plugging a grounded cord into an ungrounded outlet. With most of the travel adapters you can just do this -- the ground prong misses the adapter and is too short to interfere with the wall outlet. I had one where I needed to file down the plastic a bit to make it work, but most just work.
  
  
• Plugging a grounded cord into an ungrounded outlet safely. If this is safe is another question. Most electronics just use the ground outlet in case of a surge that causes arcing, but some need it to reduce interference. If you're really worried about arcing, you can get a GFCI adapter -- under most US building and electrical codes you can install a 3-pronged GFCI outlet and not connect the ground since the Ground Fault Circuit Interrupter is a type of circuit breaker that will cut the power if anything connects to the ground. So if you have a GFCI adapter you can cut off the ground pin and be reasonably safe. Although finding a GFCI that can handle 220v in the US can be difficult, so you're probably better off not bothering.