'Fortress of the Muslim' is the essential pocket dua book. Or use ইহরামOS for 100+ offline duas with audio, transliteration, and translations in 5 languages.
The most মুস্তাহাব physical book is 'Hisn al-Muslim' (Fortress of the Muslim) by Sa'id al-Qahtani, a compact pocket collection of authenticated duas available in dozens of languages. It is the most popular dua book among হাজীগণ worldwide.
Other excellent options include 'Accepted Whispers' (Munajat-e-Maqbul), 'The হজ্জ and উমরাহ Guide' by Dr. Talal Eid, and 'Al-Adhkar' by Imam al-Nawawi for Arabic speakers.
Digital alternatives like ইহরামOS include 100+ duas with Arabic text, transliteration, audio recitation, and translations in five languages, all offline. The advantage is searchability and no added luggage weight. A practical compromise: bring a small pocket book for rituals and use ইহরামOS for audio learning and extended sessions.