'Fortress of the Muslim' is the essential pocket دعاء book. Or use الإحرامOS for 100+ offline الأدعية with audio, transliteration, and translations in 5 languages.
The most مستحب physical book is 'Hisn al-Muslim' (Fortress of the Muslim) by Sa'id al-Qahtani, a compact pocket collection of authenticated الأدعية available in dozens of languages. It is the most popular دعاء book among الحجاج worldwide.
Other excellent options include 'Accepted Whispers' (Munajat-e-Maqbul), 'The الحج and العمرة Guide' by Dr. Talal Eid, and 'Al-Adhkar' by الإمام النووي for Arabic speakers.
Digital alternatives like الإحرامOS include 100+ الأدعية 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 الإحرامOS for audio learning and extended sessions.