A banana magazine is a curved magazine for a firearm. A "banana clip" usually holds 30 rounds. Some are more banana-like than others, though.
Century Arms US Palm AK-47 7.62x39 30 Round Magazine - Yellow Banana
Matrix 1000rd Big Banana Flash Mag for AK Series Airsoft AEG Rifles - Black - Hero Outdoors
AK Banana Clips: Get Your Banana Mag and Morale Patch
US Palm AK30 AK-47 7.62x39mm 30-Round Magazine (Banana)
7.8mb - Midsouth Shooters Supply
AK47 Banana Magazine PVC Patch
US Palm AK30 AK-47 7.62x39mm 30-Round Magazine Banana clips – Charger Arms
Military Arms Channel - PSA PALMETTO BANANA AK 7.62X39MM 30RD PMAG MAGAZINE for $29.95 ~MrsMAC
Duct Tape Pickle PVC Rubber Tactical Patch, Great for Tactical Lunch Bags
4″W x 6″H contact vinyl sticker sheet • 20 individual “banana” stickers, 0.7″W x 0.9″H, to slap onto your banana clips
BANANA CLIP CONTACT STICKER SHEET
US Palm 30 Round AK-47 Banana Magazine With Patch