These are all is MFI certified by Apple BTW
RAVPower® xRobot 6000mAh External Battery Pack For Iphone 4/4s,Iphone 5/5s,Ipad Mini,Ipad 4/3/2 - Fast Charging Power Bank Certified by Apple MFI (Apple 30 pin connector and Micro-USB embedded + 5V-2.1A/1A Dual Port)
http://amzn.com/B009S0NIDO
uNu Power DX External Protective Battery Case for iPhone 4S & 4 - MFI Apple Certified (Matte Black, Fit All Models iPhone 4 & 4S)
http://amzn.com/B00409E4JK
myCharge Peak 6000 Rechargeable Power Bank (choose your size)
http://amzn.com/B008PQAFTM
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If you want a full charge of your iPad 2 you are going to need a battery with at least 12000-13000+ may which I don't think any one has a 30pin connector built in.
I recommend this package:
Anker Astro E5 15000mAh Portable Ultra-high Density External Battery Charger for iPhone 5 (Lightning adapter not included), 4S, 4, iPad 4, 3, 2, Mini, iPods; Samsung Galaxy S4, S3, S2, Note 2; Samsung Galaxy Note 10.1, Note 8, Tab 2; HTC One, EVO, Thunderbolt, Incredible, Droid DNA; Motorola ATRIX, Droid; Google Nexus 4, Nexus 7, Nexus 10; LG Optimus [3 mobile phone connectors] - Black
http://amzn.com/B00D5T3QK4
+
Case Star ® 3pcs White 3Ft USB Charge and Sync Data Cable for Apple iPhone 3G 3GS 4 4S iPod nano iPod touch iPad 1/2/3 + Case Star Cellphone Bag
http://amzn.com/B008CC3PKU
+
(NOT TROLLING)
Ziploc Freezer Bag, Gallon Value Pack, 30-Count
http://amzn.com/B003UEGZNE
Put it in a bag. That's what I do and I do have this package but I use a lightning cable instead but I also throw in a 30 pin cable for my friends iPhone 4S.