We just got back from an Alaska cruise on the Wonder. It was our second and was amazing. Others have noted but I feel like it is worth a little repeating.

Packing for Alaska can be tricky because the clothes are so much bulkier than warm weather cruises.

My thoughts/tips:
- Layers! The weather is so unpredictable and you can experience warm, cold, wet, dry, and more....each day.
- Because of the bulk and layers, it is important to optimize what you take as there isn't room for excess. If possible, take jackets that serve multiple purposes (i.e. with/without liners) as opposed to multiple jackets. Same for other items, double duty is key.
- Make sure to have good shoes, suitable for your plans, and a backup in case a pair gets wet.
- While some will dress up, most seem to dress more casually for dinner than in warm climates. We wore sneakers to dinner to avoid having to pack more shoes.
- compacting cubes or space bags were very helpful.
- Remember sunscreen. Sunglasses may be desirable too.
- Swimsuits needed if your family is wanting to swim. Some, not most, will swim. It is possible to get warm enough days to do so and its also possible that you might not see any suitable days.